diff --git a/src/containers/CourseCard/components/CourseCardActions/SelectSessionButton.jsx b/src/containers/CourseCard/components/CourseCardActions/SelectSessionButton.jsx
index 2f6aa52..2d68f73 100644
--- a/src/containers/CourseCard/components/CourseCardActions/SelectSessionButton.jsx
+++ b/src/containers/CourseCard/components/CourseCardActions/SelectSessionButton.jsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { useDispatch } from 'react-redux';
 
 import { Button } from '@edx/paragon';
 import { useIntl } from '@edx/frontend-platform/i18n';
@@ -13,8 +12,7 @@ export const SelectSessionButton = ({ cardId }) => {
   const { canChange, hasSessions } = hooks.useCardEntitlementData(cardId);
   const { isMasquerading } = hooks.useMasqueradeData();
   const { formatMessage } = useIntl();
-  const dispatch = useDispatch();
-  const openSessionModal = hooks.useUpdateSelectSessionModalCallback(dispatch, cardId);
+  const openSessionModal = hooks.useUpdateSelectSessionModalCallback(cardId);
   return (
     <Button
       disabled={isMasquerading || !hasAccess || (!canChange || !hasSessions)}
diff --git a/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.jsx b/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.jsx
index e6401eb..3bd800b 100644
--- a/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.jsx
+++ b/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.jsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { useDispatch } from 'react-redux';
 
 import { useIntl } from '@edx/frontend-platform/i18n';
 import { Button, MailtoLink } from '@edx/paragon';
@@ -12,7 +11,6 @@ import Banner from 'components/Banner';
 import messages from './messages';
 
 export const EntitlementBanner = ({ cardId }) => {
-  const dispatch = useDispatch();
   const {
     isEntitlement,
     hasSessions,
@@ -22,7 +20,7 @@ export const EntitlementBanner = ({ cardId }) => {
     isExpired,
   } = appHooks.useCardEntitlementData(cardId);
   const { supportEmail } = appHooks.usePlatformSettingsData();
-  const openSessionModal = appHooks.useUpdateSelectSessionModalCallback(dispatch, cardId);
+  const openSessionModal = appHooks.useUpdateSelectSessionModalCallback(cardId);
   const { formatMessage } = useIntl();
   const formatDate = useFormatDate();
 
diff --git a/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.test.jsx b/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.test.jsx
index 8bceff9..16ce5e4 100644
--- a/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.test.jsx
+++ b/src/containers/CourseCard/components/CourseCardBanners/EntitlementBanner.test.jsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import { shallow } from 'enzyme';
-import { useDispatch } from 'react-redux';
 
 import { hooks as appHooks } from 'data/redux';
 import EntitlementBanner from './EntitlementBanner';
@@ -11,7 +10,7 @@ jest.mock('data/redux', () => ({
     usePlatformSettingsData: jest.fn(),
     useCardEntitlementData: jest.fn(),
     useUpdateSelectSessionModalCallback: jest.fn(
-      (_, cardId) => jest.fn().mockName(`updateSelectSessionModalCallback(${cardId})`),
+      (cardId) => jest.fn().mockName(`updateSelectSessionModalCallback(${cardId})`),
     ),
   },
 }));
@@ -36,13 +35,11 @@ const render = (overrides = {}) => {
   el = shallow(<EntitlementBanner cardId={cardId} />);
 };
 
-const dispatch = useDispatch();
-
 describe('EntitlementBanner', () => {
   test('initializes data with course number from entitlement', () => {
     render();
     expect(appHooks.useCardEntitlementData).toHaveBeenCalledWith(cardId);
-    expect(appHooks.useUpdateSelectSessionModalCallback).toHaveBeenCalledWith(dispatch, cardId);
+    expect(appHooks.useUpdateSelectSessionModalCallback).toHaveBeenCalledWith(cardId);
   });
   test('no display if not an entitlement', () => {
     render({ entitlement: { isEntitlement: false } });
diff --git a/src/containers/CourseCard/components/CourseCardDetails/hooks.js b/src/containers/CourseCard/components/CourseCardDetails/hooks.js
index 63fd9b2..0e703e7 100644
--- a/src/containers/CourseCard/components/CourseCardDetails/hooks.js
+++ b/src/containers/CourseCard/components/CourseCardDetails/hooks.js
@@ -37,7 +37,7 @@ export const useAccessMessage = ({ cardId }) => {
   return null;
 };
 
-export const useCardDetailsData = ({ dispatch, cardId }) => {
+export const useCardDetailsData = ({ cardId }) => {
   const { formatMessage } = useIntl();
   const providerName = appHooks.useCardProviderData(cardId).name;
   const { courseNumber } = appHooks.useCardCourseData(cardId);
@@ -47,7 +47,7 @@ export const useCardDetailsData = ({ dispatch, cardId }) => {
     canChange,
   } = appHooks.useCardEntitlementData(cardId);
 
-  const openSessionModal = appHooks.useUpdateSelectSessionModalCallback(dispatch, cardId);
+  const openSessionModal = appHooks.useUpdateSelectSessionModalCallback(cardId);
 
   return {
     providerName: providerName || formatMessage(messages.unknownProviderName),
diff --git a/src/containers/CourseCard/components/CourseCardDetails/index.jsx b/src/containers/CourseCard/components/CourseCardDetails/index.jsx
index 85da6b1..fedc89e 100644
--- a/src/containers/CourseCard/components/CourseCardDetails/index.jsx
+++ b/src/containers/CourseCard/components/CourseCardDetails/index.jsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { useDispatch } from 'react-redux';
 
 import { Button } from '@edx/paragon';
 
@@ -8,7 +7,6 @@ import useCardDetailsData from './hooks';
 import './index.scss';
 
 export const CourseCardDetails = ({ cardId }) => {
-  const dispatch = useDispatch();
   const {
     providerName,
     accessMessage,
@@ -18,7 +16,7 @@ export const CourseCardDetails = ({ cardId }) => {
     openSessionModal,
     courseNumber,
     changeOrLeaveSessionMessage,
-  } = useCardDetailsData({ cardId, dispatch });
+  } = useCardDetailsData({ cardId });
 
   return (
     <span className="small" data-testid="CourseCardDetails">
diff --git a/src/containers/CourseCard/components/CourseCardMenu/index.jsx b/src/containers/CourseCard/components/CourseCardMenu/index.jsx
index 9f37f04..1e5f429 100644
--- a/src/containers/CourseCard/components/CourseCardMenu/index.jsx
+++ b/src/containers/CourseCard/components/CourseCardMenu/index.jsx
@@ -71,17 +71,17 @@ export const CourseCardMenu = ({ cardId }) => {
             )}
           */}
           {twitter.isEnabled && (
-          <ReactShare.TwitterShareButton
-            url={twitter.shareUrl}
-            title={formatMessage(messages.shareQuote, {
-              courseName,
-              socialBrand: twitter.socialBrand,
-            })}
-            resetButtonStyle={false}
-            className="pgn__dropdown-item dropdown-item"
-          >
-            {formatMessage(messages.shareToTwitter)}
-          </ReactShare.TwitterShareButton>
+            <ReactShare.TwitterShareButton
+              url={twitter.shareUrl}
+              title={formatMessage(messages.shareQuote, {
+                courseName,
+                socialBrand: twitter.socialBrand,
+              })}
+              resetButtonStyle={false}
+              className="pgn__dropdown-item dropdown-item"
+            >
+              {formatMessage(messages.shareToTwitter)}
+            </ReactShare.TwitterShareButton>
           )}
         </Dropdown.Menu>
       </Dropdown>
diff --git a/src/containers/SelectSessionModal/hooks.js b/src/containers/SelectSessionModal/hooks.js
index 509b045..ced337f 100644
--- a/src/containers/SelectSessionModal/hooks.js
+++ b/src/containers/SelectSessionModal/hooks.js
@@ -15,16 +15,19 @@ export const state = StrictDict({
 });
 
 export const useSelectSessionModalData = () => {
-  const dispatch = useDispatch();
   const selectedCardId = appHooks.useSelectSessionModalData().cardId;
   const {
     availableSessions,
     isFulfilled,
-    uuid,
   } = appHooks.useCardEntitlementData(selectedCardId);
   const { title: courseTitle } = appHooks.useCardCourseData(selectedCardId);
+  const { courseId } = appHooks.useCardCourseRunData(selectedCardId) || {};
+  const { isEnrolled } = appHooks.useCardEnrollmentData(selectedCardId);
+
+  const dispatch = useDispatch();
   const { formatMessage } = useIntl();
-  const [selectedSession, setSelectedSession] = module.state.selectedSession(null);
+
+  const [selectedSession, setSelectedSession] = module.state.selectedSession(courseId || null);
 
   let header;
   let hint;
@@ -37,20 +40,24 @@ export const useSelectSessionModalData = () => {
     });
     hint = formatMessage(messages.selectSessionHint);
   }
-  const updateCallback = appHooks.useUpdateSelectSessionModalCallback;
+  const updateCardIdCallback = appHooks.useUpdateSelectSessionModalCallback;
+  const closeSessionModal = updateCardIdCallback(null);
 
   const handleSelection = ({ target: { value } }) => setSelectedSession(value);
   const handleSubmit = () => {
     if (selectedSession === LEAVE_OPTION) {
-      return dispatch(thunkActions.app.leaveEntitlementSession({ uuid }));
+      dispatch(thunkActions.app.leaveEntitlementSession(selectedCardId));
+    } else if (isEnrolled) {
+      dispatch(thunkActions.app.switchEntitlementEnrollment(selectedCardId, selectedSession));
+    } else {
+      dispatch(thunkActions.app.newEntitlementEnrollment(selectedCardId, selectedSession));
     }
-    return dispatch(thunkActions.app.switchEntitlementEnrollment({ uuid, courseId: selectedSession }));
+    closeSessionModal();
   };
 
   return {
     showModal: selectedCardId != null,
-    closeSessionModal: updateCallback(dispatch, null),
-    openSessionModal: (cardId) => updateCallback(dispatch, cardId),
+    closeSessionModal,
     showLeaveOption: isFulfilled,
     availableSessions,
     hint,
diff --git a/src/containers/SelectSessionModal/hooks.test.js b/src/containers/SelectSessionModal/hooks.test.js
index c78af8a..1cb53e7 100644
--- a/src/containers/SelectSessionModal/hooks.test.js
+++ b/src/containers/SelectSessionModal/hooks.test.js
@@ -11,10 +11,12 @@ import * as hooks from './hooks';
 
 jest.mock('data/redux', () => ({
   hooks: {
-    useCardEntitlementData: jest.fn(),
     useCardCourseData: jest.fn(),
+    useCardCourseRunData: jest.fn(),
+    useCardEnrollmentData: jest.fn(),
+    useCardEntitlementData: jest.fn(),
     useSelectSessionModalData: jest.fn(),
-    useUpdateSelectSessionModalCallback: jest.fn((...args) => ({
+    useUpdateSelectSessionModalCallback: jest.fn((...args) => () => ({
       updateSelectSession: args,
     })),
   },
@@ -25,20 +27,18 @@ jest.mock('data/redux', () => ({
   },
   thunkActions: {
     app: {
-      leaveEntitlementSession: jest.fn(),
-      switchEntitlementEnrollment: jest.fn(),
+      switchEntitlementEnrollment: jest.fn((...args) => ({ switchEntitlementEnrollment: args })),
+      leaveEntitlementSession: jest.fn((...args) => ({ leaveEntitlementSession: args })),
+      newEntitlementEnrollment: jest.fn((...args) => ({ newEntitlementEnrollment: args })),
     },
   },
 }));
 
 const state = new MockUseState(hooks);
 const selectedCardId = 'test-selected-card-id';
+const courseTitle = 'course-title: brown fox';
 const uuid = 'test-uuid';
 
-const selectSessionData = {
-  cardId: selectedCardId,
-};
-
 const entitlementData = {
   availableSessions: [
     { startDate: '1/2/2000', endDate: '1/2/2020', cardId: 'session-id-1' },
@@ -49,15 +49,14 @@ const entitlementData = {
   uuid,
 };
 
-const cardCourseData = {
-  title: 'course-title: brown fox',
-};
-
 const { formatMessage } = useIntl();
 const dispatch = useDispatch();
 
 const testValue = 'test-value';
 
+const courseId = 'test-course-id';
+appHooks.useCardCourseRunData.mockReturnValue({ courseId });
+
 describe('SelectSessionModal hooks', () => {
   let out;
 
@@ -68,19 +67,18 @@ describe('SelectSessionModal hooks', () => {
     jest.clearAllMocks();
   });
   describe('useSelectSessionModalData', () => {
-    const runHook = ({ selectSession = {}, entitlement = {}, course = {} }) => {
-      appHooks.useSelectSessionModalData.mockReturnValueOnce({
-        ...selectSessionData,
-        ...selectSession,
-      });
-      appHooks.useCardEntitlementData.mockReturnValueOnce({
-        ...entitlementData,
-        ...entitlement,
-      });
-      appHooks.useCardCourseData.mockReturnValueOnce({
-        ...cardCourseData,
-        ...course,
-      });
+    const runHook = ({
+      course = {},
+      courseRun = {},
+      enrollment = {},
+      entitlement = {},
+      selectSession = {},
+    }) => {
+      appHooks.useCardCourseData.mockReturnValueOnce({ title: courseTitle, ...course });
+      appHooks.useCardCourseRunData.mockReturnValueOnce({ courseId, ...courseRun });
+      appHooks.useCardEnrollmentData.mockReturnValueOnce({ isEnrolled: false, ...enrollment });
+      appHooks.useCardEntitlementData.mockReturnValueOnce({ ...entitlementData, ...entitlement });
+      appHooks.useSelectSessionModalData.mockReturnValueOnce({ cardId: selectedCardId, ...selectSession });
       out = hooks.useSelectSessionModalData();
     };
     beforeEach(() => {
@@ -97,8 +95,14 @@ describe('SelectSessionModal hooks', () => {
     });
 
     describe('output', () => {
-      test('selected session defaults to null', () => {
-        expect(out.selectedSession).toEqual(null);
+      describe('selectedSession', () => {
+        it('defaults to current courseId if enrolled', () => {
+          expect(out.selectedSession).toEqual(courseId);
+        });
+        it('defaults to null if not enrolled', () => {
+          runHook({ enrollment: { isEnrolled: false }, courseRun: { courseId: undefined } });
+          expect(out.selectedSession).toEqual(null);
+        });
       });
       describe('handleSelection', () => {
         it('sets selected session with event target value', () => {
@@ -107,19 +111,35 @@ describe('SelectSessionModal hooks', () => {
         });
       });
       describe('handleSubmit', () => {
-        it('dispatches updateEntitlementSession with selected card ID and session', () => {
-          state.mockVal(state.keys.selectedSession, testValue);
-          runHook({});
-          expect(out.handleSubmit()).toEqual(dispatch(
-            thunkActions.app.switchEntitlementEnrollment({ courseId: testValue, uuid }),
-          ));
+        describe('if LEAVE_OPTION is selected', () => {
+          it('dispatches leaveEntitlementSession', () => {
+            state.mockVal(state.keys.selectedSession, LEAVE_OPTION);
+            runHook({});
+            out.handleSubmit();
+            expect(dispatch).toHaveBeenCalledWith(
+              thunkActions.app.leaveEntitlementSession(selectedCardId),
+            );
+          });
         });
-        it('dispatches leaveEntitlementSession if LEAVE_OPTION is selected', () => {
-          state.mockVal(state.keys.selectedSession, LEAVE_OPTION);
-          runHook({});
-          expect(out.handleSubmit()).toEqual(dispatch(
-            thunkActions.app.leaveEntitlementSession({ uuid }),
-          ));
+        describe('if not enrolled in a session yet', () => {
+          it('dispatches newEntitlementEnrollment with selected card ID and session', () => {
+            state.mockVal(state.keys.selectedSession, testValue);
+            runHook({});
+            out.handleSubmit();
+            expect(dispatch).toHaveBeenCalledWith(
+              thunkActions.app.newEntitlementEnrollment(selectedCardId, testValue),
+            );
+          });
+        });
+        describe('if enrolled in a session already, selecting a new session', () => {
+          it('dispatches swtichEntitlementEnrollment with selected card ID and session', () => {
+            state.mockVal(state.keys.selectedSession, testValue);
+            runHook({ enrollment: { isEnrolled: true } });
+            out.handleSubmit();
+            expect(dispatch).toHaveBeenCalledWith(
+              thunkActions.app.switchEntitlementEnrollment(selectedCardId, testValue),
+            );
+          });
         });
       });
       test('showModal returns true if selectedCardId is not null or undefined', () => {
@@ -130,10 +150,7 @@ describe('SelectSessionModal hooks', () => {
         expect(out.showModal).toEqual(false);
       });
       test('displays change or leave header and hint if fulfilled', () => {
-        expect(out.header).toEqual(formatMessage(
-          messages.selectSessionHeader,
-          { courseTitle: cardCourseData.title },
-        ));
+        expect(out.header).toEqual(formatMessage(messages.selectSessionHeader, { courseTitle }));
         expect(out.hint).toEqual(formatMessage(messages.selectSessionHint));
       });
       test('displays select session header (w/ courseTitle) and hint if unfulfilled', () => {
@@ -142,8 +159,8 @@ describe('SelectSessionModal hooks', () => {
         expect(out.hint).toEqual(formatMessage(messages.changeOrLeaveHint));
       });
       test('closeSessionModal returns update callback wth dispatch and null card id', () => {
-        expect(out.closeSessionModal).toEqual(
-          appHooks.useUpdateSelectSessionModalCallback(dispatch, null),
+        expect(out.closeSessionModal()).toEqual(
+          appHooks.useUpdateSelectSessionModalCallback(null)(),
         );
       });
     });
diff --git a/src/data/redux/hooks.js b/src/data/redux/hooks.js
index 68d67e8..72bafd1 100644
--- a/src/data/redux/hooks.js
+++ b/src/data/redux/hooks.js
@@ -1,4 +1,4 @@
-import { useSelector } from 'react-redux';
+import { useSelector, useDispatch } from 'react-redux';
 
 import { actions as appActions } from './app/reducer';
 import appSelectors from './app/selectors';
@@ -58,9 +58,10 @@ export const useCardSocialSettingsData = (cardId) => {
   };
 };
 
-export const useUpdateSelectSessionModalCallback = (dispatch, cardId) => () => dispatch(
-  appActions.updateSelectSessionModal(cardId),
-);
+export const useUpdateSelectSessionModalCallback = (cardId) => {
+  const dispatch = useDispatch();
+  return () => dispatch(appActions.updateSelectSessionModal(cardId));
+};
 
 export const useMasqueradeData = () => useSelector(requestSelectors.masquerade);
 
diff --git a/src/data/redux/thunkActions/app.js b/src/data/redux/thunkActions/app.js
index d518fae..8f961a2 100644
--- a/src/data/redux/thunkActions/app.js
+++ b/src/data/redux/thunkActions/app.js
@@ -38,7 +38,8 @@ export const newEntitlementEnrollment = (cardId, selection) => (dispatch, getSta
     fromCourseRun: null,
     toCourseRun: selection,
   });
-  return dispatch(requests.newEntitlementEnrollment({ uuid, courseId: selection }));
+  dispatch(requests.newEntitlementEnrollment({ uuid, courseId: selection }));
+  dispatch(initialize());
 };
 
 export const switchEntitlementEnrollment = (cardId, selection) => (dispatch, getState) => {
@@ -48,7 +49,8 @@ export const switchEntitlementEnrollment = (cardId, selection) => (dispatch, get
     fromCourseRun: courseId,
     toCourseRun: selection,
   });
-  return dispatch(requests.switchEntitlementEnrollment({ uuid, courseId: selection }));
+  dispatch(requests.switchEntitlementEnrollment({ uuid, courseId: selection }));
+  dispatch(initialize());
 };
 
 export const leaveEntitlementSession = (cardId) => (dispatch, getState) => {
@@ -58,7 +60,8 @@ export const leaveEntitlementSession = (cardId) => (dispatch, getState) => {
     fromCourseRun: courseId,
     toCourseRun: null,
   });
-  return dispatch(requests.leaveEntitlementSession({ uuid }));
+  dispatch(requests.leaveEntitlementSession({ uuid }));
+  dispatch(initialize());
 };
 
 export const unenrollFromCourse = (cardId, reason) => (dispatch, getState) => {