Fix registration OTP anchor and batch task state

tests/test_account_token_sync_status.py

@@ -70,3 +70,37 @@ def test_update_account_preserves_pending_status_when_other_tokens_remain(tmp_pa
         assert updated.refresh_token == ""
         assert updated.token_sync_status == "pending"
         assert updated.token_sync_updated_at is not None
+
+
+def test_update_outlook_refresh_token_persists_nested_config_changes(tmp_path):
+    manager = DatabaseSessionManager(f"sqlite:///{tmp_path}/test.db")
+    manager.create_tables()
+    manager.migrate_tables()
+
+    with manager.session_scope() as session:
+        service = crud.create_email_service(
+            session,
+            service_type="outlook",
+            name="outlook-service",
+            config={
+                "accounts": [
+                    {"email": "first@example.com", "refresh_token": "old-first"},
+                    {"email": "second@example.com", "refresh_token": "old-second"},
+                ]
+            },
+        )
+        service_id = service.id
+
+        crud.update_outlook_refresh_token(
+            session,
+            service_id=service_id,
+            email="second@example.com",
+            new_refresh_token="new-second",
+        )
+
+    with manager.session_scope() as session:
+        reloaded = crud.get_email_service_by_id(session, service_id)
+
+        assert reloaded is not None
+        assert reloaded.config["accounts"][0]["refresh_token"] == "old-first"
+        assert reloaded.config["accounts"][1]["refresh_token"] == "new-second"