diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 3f9abcc671fb..a05b78e8837a 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -17,6 +17,7 @@ lms/djangoapps/instructor_task/
 lms/djangoapps/mobile_api/
 openedx/core/djangoapps/credentials                                 @openedx/2U-aperture
 openedx/core/djangoapps/credit                                      @openedx/2U-aperture
+openedx/core/djangoapps/enrollments/                                @openedx/2U-aperture
 openedx/core/djangoapps/heartbeat/
 openedx/core/djangoapps/oauth_dispatch
 openedx/core/djangoapps/user_api/                                   @openedx/2U-aperture
@@ -37,8 +38,9 @@ lms/djangoapps/certificates/                                        @openedx/2U-
 # Discovery
 common/djangoapps/course_modes/
 common/djangoapps/enrollment/
+lms/djangoapps/branding/                                             @openedx/2U-aperture
 lms/djangoapps/commerce/
-lms/djangoapps/experiments/
+lms/djangoapps/experiments/                                          @openedx/2U-aperture
 lms/djangoapps/learner_dashboard/                                    @openedx/2U-aperture
 lms/djangoapps/learner_home/                                         @openedx/2U-aperture
 openedx/features/content_type_gating/
diff --git a/lms/djangoapps/bulk_email/tasks.py b/lms/djangoapps/bulk_email/tasks.py
index 2b96af786a97..184dfd0e6869 100644
--- a/lms/djangoapps/bulk_email/tasks.py
+++ b/lms/djangoapps/bulk_email/tasks.py
@@ -474,6 +474,7 @@ def _send_course_email(entry_id, email_id, to_list, global_email_context, subtas
             'course_id': str(course_email.course_id),
             'to_list': [user_obj.get('email', '') for user_obj in to_list],
             'total_recipients': total_recipients,
+            'ace_enabled_for_bulk_email': is_bulk_email_edx_ace_enabled(),
         }
     )
     # Exclude optouts (if not a retry):
diff --git a/lms/djangoapps/discussion/rest_api/discussions_notifications.py b/lms/djangoapps/discussion/rest_api/discussions_notifications.py
index 25abcf80d486..f65faf7f2a67 100644
--- a/lms/djangoapps/discussion/rest_api/discussions_notifications.py
+++ b/lms/djangoapps/discussion/rest_api/discussions_notifications.py
@@ -399,4 +399,18 @@ def clean_thread_html_body(html_body):
         for match in html_body.find_all(tag):
             match.unwrap()
 
+    # Replace tags that are not allowed in email
+    tags_to_update = [
+        {"source": "button", "target": "span"},
+        {"source": "h1", "target": "h4"},
+        {"source": "h2", "target": "h4"},
+        {"source": "h3", "target": "h4"},
+    ]
+    for tag_dict in tags_to_update:
+        for source_tag in html_body.find_all(tag_dict['source']):
+            target_tag = html_body.new_tag(tag_dict['target'], **source_tag.attrs)
+            if source_tag.string:
+                target_tag.string = source_tag.string
+            source_tag.replace_with(target_tag)
+
     return str(html_body)
diff --git a/lms/djangoapps/discussion/rest_api/tests/test_discussions_notifications.py b/lms/djangoapps/discussion/rest_api/tests/test_discussions_notifications.py
index f1a71fd1239e..d92e1000feb5 100644
--- a/lms/djangoapps/discussion/rest_api/tests/test_discussions_notifications.py
+++ b/lms/djangoapps/discussion/rest_api/tests/test_discussions_notifications.py
@@ -168,3 +168,29 @@ def test_only_script_tag(self):
 
         result = clean_thread_html_body(html_body)
         self.assertEqual(result.strip(), expected_output)
+
+    def test_button_tag_replace(self):
+        """
+        Tests that the clean_thread_html_body function replaces the button tag with span tag
+        """
+        # Tests for button replacement tag with text
+        html_body = '<button class="abc">Button</button>'
+        expected_output = '<span class="abc">Button</span>'
+        result = clean_thread_html_body(html_body)
+        self.assertEqual(result, expected_output)
+
+        # Tests button tag replacement without text
+        html_body = '<button class="abc"></button>'
+        expected_output = '<span class="abc"></span>'
+        result = clean_thread_html_body(html_body)
+        self.assertEqual(result, expected_output)
+
+    def test_heading_tag_replace(self):
+        """
+        Tests that the clean_thread_html_body function replaces the h1, h2 and h3 tags with h4 tag
+        """
+        for tag in ['h1', 'h2', 'h3']:
+            html_body = f'<{tag}>Heading</{tag}>'
+            expected_output = '<h4>Heading</h4>'
+            result = clean_thread_html_body(html_body)
+            self.assertEqual(result, expected_output)
diff --git a/openedx/core/djangoapps/content/search/api.py b/openedx/core/djangoapps/content/search/api.py
index 3e0fadd717a9..a87510847068 100644
--- a/openedx/core/djangoapps/content/search/api.py
+++ b/openedx/core/djangoapps/content/search/api.py
@@ -316,6 +316,8 @@ def rebuild_index(status_cb: Callable[[str], None] | None = None) -> None:
         client.index(temp_index_name).update_distinct_attribute(Fields.usage_key)
         # Mark which attributes can be used for filtering/faceted search:
         client.index(temp_index_name).update_filterable_attributes([
+            # Get specific block/collection using combination of block_id and context_key
+            Fields.block_id,
             Fields.block_type,
             Fields.context_key,
             Fields.org,
diff --git a/openedx/core/djangoapps/notifications/base_notification.py b/openedx/core/djangoapps/notifications/base_notification.py
index 02b49df89444..b57d88cea616 100644
--- a/openedx/core/djangoapps/notifications/base_notification.py
+++ b/openedx/core/djangoapps/notifications/base_notification.py
@@ -212,8 +212,8 @@
         'name': 'ora_grade_assigned',
         'is_core': False,
         'info': '',
-        'web': False,
-        'email': False,
+        'web': True,
+        'email': True,
         'push': False,
         'email_cadence': EmailCadence.DAILY,
         'non_editable': [],
diff --git a/openedx/core/djangoapps/notifications/tests/test_views.py b/openedx/core/djangoapps/notifications/tests/test_views.py
index 27b369d925af..b7bd0414a27f 100644
--- a/openedx/core/djangoapps/notifications/tests/test_views.py
+++ b/openedx/core/djangoapps/notifications/tests/test_views.py
@@ -315,8 +315,8 @@ def _expected_api_response(self, course=None):
                             'info': 'Notifications for submission grading.'
                         },
                         'ora_grade_assigned': {
-                            'web': False,
-                            'email': False,
+                            'web': True,
+                            'email': True,
                             'push': False,
                             'email_cadence': 'Daily',
                             'info': ''