diff --git a/lms/djangoapps/certificates/tests/test_models.py b/lms/djangoapps/certificates/tests/test_models.py
index 3618fb027a..f0e21e09c1 100644
--- a/lms/djangoapps/certificates/tests/test_models.py
+++ b/lms/djangoapps/certificates/tests/test_models.py
@@ -343,4 +343,4 @@ class CertificateInvalidationTest(SharedModuleStoreTestCase):
         self.certificate.invalidate()
 
         assert mock_revoke_task.call_count == 1
-        assert mock_revoke_task.call_args[0] == (self.user.username, self.course_id)
+        assert mock_revoke_task.call_args[0] == (self.user.username, str(self.course_id))
diff --git a/openedx/core/djangoapps/programs/signals.py b/openedx/core/djangoapps/programs/signals.py
index 0ecb2f786e..a548f597a6 100644
--- a/openedx/core/djangoapps/programs/signals.py
+++ b/openedx/core/djangoapps/programs/signals.py
@@ -169,15 +169,11 @@ def handle_course_cert_revoked(sender, user, course_key, mode, status, **kwargs)
 
     # schedule background task to process
     LOGGER.info(
-        'handling COURSE_CERT_REVOKED: username=%s, course_key=%s, mode=%s, status=%s',
-        user,
-        course_key,
-        mode,
-        status,
+        f"handling COURSE_CERT_REVOKED: user={user.id}, course_key={course_key}, mode={mode}, status={status}"
     )
     # import here, because signal is registered at startup, but items in tasks are not yet able to be loaded
     from openedx.core.djangoapps.programs.tasks import revoke_program_certificates
-    revoke_program_certificates.delay(user.username, course_key)
+    revoke_program_certificates.delay(user.username, str(course_key))
 
 
 @receiver(COURSE_CERT_DATE_CHANGE, dispatch_uid='course_certificate_date_change_handler')
diff --git a/openedx/core/djangoapps/programs/tasks.py b/openedx/core/djangoapps/programs/tasks.py
index 26f40ffcb6..49ec1978e4 100644
--- a/openedx/core/djangoapps/programs/tasks.py
+++ b/openedx/core/djangoapps/programs/tasks.py
@@ -467,7 +467,7 @@ def revoke_program_certificates(self, username, course_key):  # lint-amnesty, py
 
     Args:
         username (str): The username of the student
-        course_key (str|CourseKey): The course identifier
+        course_key (str): The course identifier
 
     Returns:
         None
@@ -510,7 +510,7 @@ def revoke_program_certificates(self, username, course_key):  # lint-amnesty, py
 
     try:
         inverted_programs = get_inverted_programs(student)
-        course_specific_programs = inverted_programs.get(str(course_key))
+        course_specific_programs = inverted_programs.get(course_key)
         if not course_specific_programs:
             # No reason to continue beyond this point
             LOGGER.info(
diff --git a/openedx/core/djangoapps/programs/tests/test_signals.py b/openedx/core/djangoapps/programs/tests/test_signals.py
index fe7c4c5122..f27ace45f5 100644
--- a/openedx/core/djangoapps/programs/tests/test_signals.py
+++ b/openedx/core/djangoapps/programs/tests/test_signals.py
@@ -230,7 +230,7 @@ class CertRevokedReceiverTest(TestCase):
 
         assert mock_is_learner_issuance_enabled.call_count == 1
         assert mock_task.call_count == 1
-        assert mock_task.call_args[0] == (TEST_USERNAME, TEST_COURSE_KEY)
+        assert mock_task.call_args[0] == (TEST_USERNAME, str(TEST_COURSE_KEY))
 
 
 @skip_unless_lms
diff --git a/openedx/core/djangoapps/programs/tests/test_tasks.py b/openedx/core/djangoapps/programs/tests/test_tasks.py
index bcdbc55a88..d67c8066ff 100644
--- a/openedx/core/djangoapps/programs/tests/test_tasks.py
+++ b/openedx/core/djangoapps/programs/tests/test_tasks.py
@@ -676,6 +676,27 @@ class RevokeProgramCertificatesTestCase(CatalogIntegrationMixin, CredentialsApiC
 
         self.inverted_programs = {self.course_key: [{'uuid': 1}, {'uuid': 2}]}
 
+    def _make_side_effect(self, side_effects):
+        """
+        DRY helper.  Returns a side effect function for use with mocks that
+        will be called multiple times, permitting Exceptions to be raised
+        (or not) in a specified order.
+
+        See Also:
+            http://www.voidspace.org.uk/python/mock/examples.html#multiple-calls-with-different-effects
+            http://www.voidspace.org.uk/python/mock/mock.html#mock.Mock.side_effect
+
+        """
+
+        def side_effect(*_a):
+            if side_effects:
+                exc = side_effects.pop(0)
+                if exc:
+                    raise exc
+            return mock.DEFAULT
+
+        return side_effect
+
     def test_inverted_programs(
         self,
         mock_get_inverted_programs,
@@ -689,7 +710,7 @@ class RevokeProgramCertificatesTestCase(CatalogIntegrationMixin, CredentialsApiC
         tasks.revoke_program_certificates.delay(self.student.username, self.course_key).get()
         mock_get_inverted_programs.assert_any_call(self.student)
 
-    def test_revokinging_certificate(
+    def test_revoke_program_certificate(
         self,
         mock_get_inverted_programs,
         mock_get_certified_programs,
@@ -760,27 +781,6 @@ class RevokeProgramCertificatesTestCase(CatalogIntegrationMixin, CredentialsApiC
         assert not mock_get_certified_programs.called
         assert not mock_revoke_program_certificate.called
 
-    def _make_side_effect(self, side_effects):
-        """
-        DRY helper.  Returns a side effect function for use with mocks that
-        will be called multiple times, permitting Exceptions to be raised
-        (or not) in a specified order.
-
-        See Also:
-            http://www.voidspace.org.uk/python/mock/examples.html#multiple-calls-with-different-effects
-            http://www.voidspace.org.uk/python/mock/mock.html#mock.Mock.side_effect
-
-        """
-
-        def side_effect(*_a):
-            if side_effects:
-                exc = side_effects.pop(0)
-                if exc:
-                    raise exc
-            return mock.DEFAULT
-
-        return side_effect
-
     def test_continue_revoking_certs_if_error(
         self,
         mock_get_inverted_programs,