diff --git a/backend/app/gateway/routers/api_keys.py b/backend/app/gateway/routers/api_keys.py
index f890fd54..4662bee5 100644
--- a/backend/app/gateway/routers/api_keys.py
+++ b/backend/app/gateway/routers/api_keys.py
@@ -11,7 +11,7 @@ from __future__ import annotations
 from datetime import datetime
 from typing import Literal
 
-from fastapi import APIRouter, Depends, HTTPException, Request, Response
+from fastapi import APIRouter, Depends, HTTPException, Response
 from pydantic import BaseModel, Field
 
 from app.gateway.authz import require_workspace_admin
@@ -66,11 +66,12 @@ async def _require_sa_in_workspace(sa_id: str, sa_repo: ServiceAccountRepository
 @router.post("", status_code=201, dependencies=[Depends(require_workspace_admin)])
 async def create_api_key(
     body: CreateApiKeyRequest,
-    request: Request,
     key_repo: ApiKeyRepository = Depends(get_api_key_repo),
     sa_repo: ServiceAccountRepository = Depends(get_service_account_repo),
 ):
-    await _require_sa_in_workspace(body.service_account_id, sa_repo)
+    sa = await _require_sa_in_workspace(body.service_account_id, sa_repo)
+    if sa["status"] != "active":
+        raise HTTPException(status_code=409, detail="service account is not active")
     gen = generate_api_key(body.env)
     created = await key_repo.create(
         service_account_id=body.service_account_id,
diff --git a/backend/tests/test_api_keys_router.py b/backend/tests/test_api_keys_router.py
index a5c6810a..1b708e59 100644
--- a/backend/tests/test_api_keys_router.py
+++ b/backend/tests/test_api_keys_router.py
@@ -123,3 +123,37 @@ async def test_member_cannot_create_key(tmp_path):
         assert r.status_code == 403
     finally:
         await _cleanup()
+
+
+async def test_revoke_other_workspace_key_404(tmp_path):
+    await _init_db_with_sa(tmp_path, sa_id="sa-1", workspace_id="w-1")
+    try:
+        client_a = TestClient(_make_app(workspace_id="w-1"))
+        created = client_a.post("/api/v1/api-keys", json={"service_account_id": "sa-1", "name": "k", "scopes": ""}).json()
+        client_b = TestClient(_make_app(workspace_id="w-2"))
+        assert client_b.delete(f"/api/v1/api-keys/{created['id']}").status_code == 404
+    finally:
+        await _cleanup()
+
+
+async def test_list_other_workspace_sa_404(tmp_path):
+    await _init_db_with_sa(tmp_path, sa_id="sa-1", workspace_id="w-1")
+    try:
+        client_b = TestClient(_make_app(workspace_id="w-2"))
+        assert client_b.get("/api/v1/api-keys", params={"service_account_id": "sa-1"}).status_code == 404
+    finally:
+        await _cleanup()
+
+
+async def test_create_for_suspended_sa_409(tmp_path):
+    await _init_db_with_sa(tmp_path)
+    try:
+        from deerflow.persistence.engine import get_session_factory
+        from deerflow.persistence.service_account import ServiceAccountRepository
+
+        await ServiceAccountRepository(get_session_factory()).update_status("sa-1", "suspended")
+        client = TestClient(_make_app())
+        r = client.post("/api/v1/api-keys", json={"service_account_id": "sa-1", "name": "x", "scopes": ""})
+        assert r.status_code == 409
+    finally:
+        await _cleanup()