diff --git a/apps/api/plane/api/views/personal_task.py b/apps/api/plane/api/views/personal_task.py
index a4a023ce719..34decae2bd2 100644
--- a/apps/api/plane/api/views/personal_task.py
+++ b/apps/api/plane/api/views/personal_task.py
@@ -190,9 +190,20 @@ def post(self, request, slug):
         serializer.save()
         issue = Issue.objects.get(pk=serializer.data["id"])
 
+        # `create_issue_activity` (issue_activities_task.py) gates the
+        # assignee tracking branch on `requested_data["assignee_ids"]`
+        # being present, but the API IssueSerializer uses `assignees` as
+        # its write key. Without this alias the assignee IssueActivity
+        # row is never written, so `dispatch_lark_for_activities` has
+        # nothing to fan out and Lark DMs never fire for assignees on
+        # personal-task creation.
+        activity_payload = dict(payload)
+        if "assignees" in activity_payload and "assignee_ids" not in activity_payload:
+            activity_payload["assignee_ids"] = activity_payload["assignees"]
+
         issue_activity.delay(
             type="issue.activity.created",
-            requested_data=json.dumps(payload, cls=DjangoJSONEncoder),
+            requested_data=json.dumps(activity_payload, cls=DjangoJSONEncoder),
             actor_id=str(request.user.id),
             issue_id=str(issue.id),
             project_id=str(project.id),
diff --git a/apps/api/plane/tests/contract/api/test_personal_tasks.py b/apps/api/plane/tests/contract/api/test_personal_tasks.py
index 39c05adc4fe..7617ac057a5 100644
--- a/apps/api/plane/tests/contract/api/test_personal_tasks.py
+++ b/apps/api/plane/tests/contract/api/test_personal_tasks.py
@@ -5,6 +5,7 @@
 """Contract tests for the personal-tasks token endpoint
 (``/api/v1/workspaces/{slug}/personal-tasks/``)."""
 
+import json
 import uuid
 
 import pytest
@@ -397,6 +398,40 @@ def test_patch_triggers_model_activity_for_webhook_fanout(
         assert kwargs["current_instance"] is not None
         assert kwargs["slug"] == workspace_with_owner.slug
 
+    @pytest.mark.django_db
+    def test_post_requested_data_includes_assignee_ids_for_lark_gate(
+        self, system_api_client, workspace_with_owner, owner_user, mocker
+    ):
+        """The real Lark fan-out path: ``create_issue_activity``
+        (issue_activities_task.py:581) only calls ``track_assignees``
+        when ``requested_data.get('assignee_ids') is not None``. Our
+        API serializer uses the ``assignees`` key, so the issue_activity
+        payload MUST mirror it under ``assignee_ids`` or the assignee
+        IssueActivity row is never emitted and dispatch_lark_for_activities
+        sees nothing to DM.
+        """
+        spy = mocker.patch("plane.api.views.personal_task.issue_activity.delay")
+        response = system_api_client.post(
+            _personal_tasks_url(workspace_with_owner.slug),
+            data={
+                "owner": str(owner_user.id),
+                "name": "Notify me on Lark",
+                "external_source": "task-manager-v1",
+                "external_id": "lark-gate-1",
+            },
+            format="json",
+            HTTP_HOST="task.example.com",
+        )
+        assert response.status_code == status.HTTP_201_CREATED, response.content
+        assert spy.called, "issue_activity.delay was not invoked"
+        requested_data = json.loads(spy.call_args.kwargs["requested_data"])
+        assert "assignee_ids" in requested_data, (
+            "issue_activity.requested_data is missing 'assignee_ids' — "
+            "create_issue_activity will skip track_assignees and no Lark "
+            "DM will fire."
+        )
+        assert requested_data["assignee_ids"] == [str(owner_user.id)]
+
     @pytest.mark.django_db
     def test_idempotent_409_reuse_does_not_trigger_model_activity(
         self, system_api_client, workspace_with_owner, owner_user, mocker