diff --git a/app/controllers/aaManager.py b/app/controllers/aaManager.py
index 97a3531..0fc1756 100644
--- a/app/controllers/aaManager.py
+++ b/app/controllers/aaManager.py
@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, status
 from sqlmodel import Session, select
 from sqlalchemy.orm import selectinload
 from typing import List
@@ -44,7 +44,7 @@ def assign_accessauth(*, db: Session = Depends(get_session), group_id: int, aa_i
     if db_aa is None:
         raise HTTPException(status_code=404, detail="AA not found")
     if db_aa in db_group.accessauths:
-        raise HTTPException(status_code=200, detail="AA already assigned to group")
+        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="AA already assigned to group")
     db_group.accessauths.append(db_aa)
     return add_and_refresh(db, db_group)
 
diff --git a/test/test_services/test_aa_manager.py b/test/test_services/test_aa_manager.py
index 5f5566d..292397f 100644
--- a/test/test_services/test_aa_manager.py
+++ b/test/test_services/test_aa_manager.py
@@ -75,8 +75,9 @@ def test_assign_already_assigned_access_auth(client, auth_headers, test_group, t
         f"/aa/assign/{test_group.id}/{test_aa.id}", 
         headers=auth_headers
     )
-    # According to the code, this returns 200 with "already assigned" message
-    assert response.status_code == 200
+    # According to the code, this returns 409 with "already assigned" message
+    assert response.status_code == 409
+    assert "already assigned" in response.json()["detail"].lower()
 
 
 def test_unassign_access_auth_from_group(client, auth_headers, test_group, test_aa):