diff --git a/lms/djangoapps/instructor/tests/test_api.py b/lms/djangoapps/instructor/tests/test_api.py
index bb2be51e9640..f5d8b0408950 100644
--- a/lms/djangoapps/instructor/tests/test_api.py
+++ b/lms/djangoapps/instructor/tests/test_api.py
@@ -2252,17 +2252,26 @@ def test_modify_access_bad_role(self):
         })
         assert response.status_code == 400
 
-    def test_modify_access_allow(self):
-        assert CourseEnrollment.is_enrolled(self.other_user, self.course.id) is False
-        url = reverse('modify_access', kwargs={'course_id': str(self.course.id)})
-        response = self.client.post(url, {
-            'unique_student_identifier': self.other_user.email,
-            'rolename': 'staff',
-            'action': 'allow',
-        })
-        assert response.status_code == 200
-        # User should be auto enrolled in the course
-        assert CourseEnrollment.is_enrolled(self.other_user, self.course.id)
+    def test_modify_access_api(self):
+        for rolename in ["staff", "limited_staff", "instructor", "data_researcher"]:
+            assert CourseEnrollment.is_enrolled(self.other_user, self.course.id) is False
+            url = reverse('modify_access', kwargs={'course_id': str(self.course.id)})
+            response = self.client.post(url, {
+                'unique_student_identifier': self.other_user.email,
+                'rolename': rolename,
+                'action': 'allow',
+            })
+            assert response.status_code == 200
+            # User should be auto enrolled in the course
+            assert CourseEnrollment.is_enrolled(self.other_user, self.course.id)
+            # Test role revoke action
+            response = self.client.post(url, {
+                'unique_student_identifier': self.other_user.email,
+                'rolename': rolename,
+                'action': 'revoke',
+            })
+            assert response.status_code == 200
+            CourseEnrollment.unenroll(self.other_user, self.course.id)
 
     def test_modify_access_allow_with_uname(self):
         url = reverse('modify_access', kwargs={'course_id': str(self.course.id)})
@@ -2273,15 +2282,6 @@ def test_modify_access_allow_with_uname(self):
         })
         assert response.status_code == 200
 
-    def test_modify_access_revoke(self):
-        url = reverse('modify_access', kwargs={'course_id': str(self.course.id)})
-        response = self.client.post(url, {
-            'unique_student_identifier': self.other_staff.email,
-            'rolename': 'staff',
-            'action': 'revoke',
-        })
-        assert response.status_code == 200
-
     def test_modify_access_revoke_with_username(self):
         url = reverse('modify_access', kwargs={'course_id': str(self.course.id)})
         response = self.client.post(url, {
@@ -2443,6 +2443,19 @@ def assert_update_forum_role_membership(self, current_user, identifier, rolename
         elif action == 'revoke':
             assert rolename not in user_roles
 
+    def test_autoenroll_on_forum_role_add(self):
+        """
+        Test forum role modification auto enrolls user.
+        """
+        seed_permissions_roles(self.course.id)
+        user = UserFactory()
+        for rolename in ["Administrator", "Moderator", "Community TA"]:
+            assert CourseEnrollment.is_enrolled(user, self.course.id) is False
+            self.assert_update_forum_role_membership(user, user.email, rolename, "allow")
+            assert CourseEnrollment.is_enrolled(user, self.course.id)
+            self.assert_update_forum_role_membership(user, user.email, rolename, "revoke")
+            CourseEnrollment.unenroll(user, self.course.id)
+
 
 @ddt.ddt
 class TestInstructorAPILevelsDataDump(SharedModuleStoreTestCase, LoginEnrollmentTestCase):
diff --git a/lms/djangoapps/instructor/views/api.py b/lms/djangoapps/instructor/views/api.py
index ddcfa7b7aba3..6d7dfe17a9d7 100644
--- a/lms/djangoapps/instructor/views/api.py
+++ b/lms/djangoapps/instructor/views/api.py
@@ -2812,7 +2812,8 @@ def update_forum_role_membership(request, course_id):
         ))
 
     user = get_student_from_identifier(unique_student_identifier)
-
+    if action == 'allow' and not is_user_enrolled_in_course(user, course_id):
+        CourseEnrollment.enroll(user, course_id)
     try:
         update_forum_role(course_id, user, rolename, action)
     except Role.DoesNotExist:
diff --git a/lms/templates/instructor/instructor_dashboard_2/membership.html b/lms/templates/instructor/instructor_dashboard_2/membership.html
index 5a477665868a..9b1f64dfb9d1 100644
--- a/lms/templates/instructor/instructor_dashboard_2/membership.html
+++ b/lms/templates/instructor/instructor_dashboard_2/membership.html
@@ -229,8 +229,9 @@ <h3 class="hd hd-3">${_("Course Team Management")}</h3>
         ${_("Discussion Admins can edit or delete any post, clear misuse flags, close "
          "and re-open threads, endorse responses, and see posts from all groups. "
          "Their posts are marked as 'staff'. They can also add and remove the "
-         "discussion moderation roles to manage course team membership. Only "
-         "enrolled users can be added as Discussion Admins.")}"
+         "discussion moderation roles to manage course team membership. Any users "
+         "not yet enrolled in the course will be automatically enrolled when added as "
+         "Discussion Admin")}"
       data-list-endpoint="${ section_data['list_forum_members_url'] }"
       data-modify-endpoint="${ section_data['update_forum_role_membership_url'] }"
       data-add-button-label="${_("Add Discussion Admin")}"
@@ -257,8 +258,8 @@ <h3 class="hd hd-3">${_("Course Team Management")}</h3>
         ${_("Discussion Moderators can edit or delete any post, clear misuse flags, close "
          "and re-open threads, endorse responses, and see posts from all groups. "
          "Their posts are marked as 'staff'. They cannot manage course team membership by "
-         "adding or removing discussion moderation roles. Only enrolled users can be "
-         "added as Discussion Moderators.")}"
+         "adding or removing discussion moderation roles. Any users not yet enrolled "
+         "in the course will be automatically enrolled when added as Discussion Moderator")}"
       data-list-endpoint="${ section_data['list_forum_members_url'] }"
       data-modify-endpoint="${ section_data['update_forum_role_membership_url'] }"
       data-add-button-label="${_("Add Moderator")}"
@@ -271,8 +272,8 @@ <h3 class="hd hd-3">${_("Course Team Management")}</h3>
         ${_("Group Community TAs are members of the community who help course teams moderate discussions. Group "
             "Community TAs see only posts by learners in their assigned group. They can edit or delete posts, "
             "clear flags, close and re-open threads, and endorse responses, but only for posts by learners in "
-            "their group. Their posts are marked as 'Community TA'. Only enrolled learners can be added as Group "
-            "Community TAs.")}"
+            "their group. Their posts are marked as 'Community TA'. Any users not yet enrolled "
+            "in the course will be automatically enrolled when added as Group Community TA")}"
       data-list-endpoint="${ section_data['list_forum_members_url'] }"
       data-modify-endpoint="${ section_data['update_forum_role_membership_url'] }"
       data-add-button-label="${_("Add Group Community TA")}"
@@ -285,7 +286,7 @@ <h3 class="hd hd-3">${_("Course Team Management")}</h3>
         ${_("Community TAs are members of the community who help course teams moderate discussions. "
         "They can see posts by learners in their assigned cohort or enrollment track, and can edit or delete posts, "
         "clear flags, close or re-open threads, and endorse responses. Their posts are marked as 'Community TA'. "
-        "Only enrolled learners can be added as Community TAs.")}"
+        "Any users not yet enrolled in the course will be automatically enrolled when added as Community TA")}"
       data-list-endpoint="${ section_data['list_forum_members_url'] }"
       data-modify-endpoint="${ section_data['update_forum_role_membership_url'] }"
       data-add-button-label="${_("Add Community TA")}"