diff --git a/app/credential_actions.py b/app/credential_actions.py
index 4141b06..3226ffa 100644
--- a/app/credential_actions.py
+++ b/app/credential_actions.py
@@ -50,11 +50,11 @@ def run(gateway, action, identity=None, *, consent_revision=None):
                         result.update(travel=followup, checkin_ok=result["ok"],
                                       ok=result["ok"] if followup.get("buddy_blocked") else result["ok"] and followup["ok"],
                                       message=result["message"] + "；" + followup["message"])
-                except Exception:
+                except Exception as error:
                     # Upstream exception text may contain headers or credential file paths.
                     if action == "checkin" and result["ok"]:
                         result["checkin_ok"] = True
-                    result.update(ok=False, message="操作失败，保留已有数据；请检查账号状态后重试")
+                    result.update(ok=False, message=f"操作失败（{type(error).__name__}），保留已有数据；请检查账号状态后重试")
             results.append(result)
             _audit(config, result, started)
         response = {"ok": bool(results) and all(r["ok"] for r in results), "results": results}
diff --git a/app/gateway_management.py b/app/gateway_management.py
index c21ee33..8293bba 100644
--- a/app/gateway_management.py
+++ b/app/gateway_management.py
@@ -59,6 +59,7 @@ def admin_credential_inventory(self):
                                             "http_403" if entry.get("last_error") == "backend HTTP 403" else
                                             "credential_error" if entry.get("last_error") else None),
                            last_failure_at=entry.get("last_failure_at"),
+                           sync_error=(balance.get("error") or entry.get("last_error") or None),
                            cooldowns=cooldowns, credits=balance.get("credits") or None,
                            sync_pending=path in pool._sync_pending or path in pool._syncing or path in pool._sync_retry,
                            catalog_ready=(self.CONFIG.get("account_catalogs") or {}).get(identity, {}).get("models") is not None,
diff --git a/web/src/pages/Credentials.tsx b/web/src/pages/Credentials.tsx
index 3a87787..5de8bac 100644
--- a/web/src/pages/Credentials.tsx
+++ b/web/src/pages/Credentials.tsx
@@ -37,6 +37,15 @@ function expiry(value: unknown, milliseconds = false) {
     ? new Date(milliseconds ? value : value * 1000).toLocaleString("zh-CN")
     : text(value);
 }
+const lastErrorLabels: Record<string, string> = {
+  http_401: "上游 401（登录态被拒）",
+  http_403: "上游 403（无权限）",
+  credential_error: "凭证同步失败（详见操作结果）",
+};
+function lastErrorLabel(value: unknown) {
+  const key = text(value);
+  return lastErrorLabels[key] ?? key;
+}
 export { safeOAuthUrl } from "../OAuth";
 function boundModels(credential: Credential): string[] {
   return Array.isArray(credential.bindings)
@@ -430,6 +439,17 @@ export function Credentials() {
                                 : text(c.health)}
                           </Badge>
                           <small>{c.token_expired === true ? "Token 已过期" : ""}</small>
+                          {c.last_error_code != null && (
+                            <small>
+                              最近错误：{text(lastErrorLabel(c.last_error_code))}
+                              {number(c.last_failure_at) !== null
+                                ? ` · ${expiry(c.last_failure_at)}`
+                                : ""}
+                            </small>
+                          )}
+                          {typeof c.sync_error === "string" && c.sync_error !== "" && (
+                            <small>失败原因：{text(c.sync_error)}</small>
+                          )}
                         </td>
                         <td>
                           {cooldowns ? (