如果成功调用云消息队列 MQTT 版的OpenAPI，则会返回给客户端ResponseCode=200；如果调用失败，会返回对应的异常错误码以及描述信息。您可以根据以下异常信息对照表查找对应的解决方法。
Token相关错误码
| HttpCode | 错误码 | 错误信息 | 描述 |
|---|---|---|---|
| 404 | ApiNotSupport | The specified API is not supported. | 当前接口不支持，请检查。 |
| 400 | ApplyTokenOverFlow | You have applied for tokens too many times. Please try again later. | 申请token频率过高，系统限流，请重试。 |
| 400 | CheckAccountInfoFailed | An error occurred while checking the account information by the STS token. | 解析STS token账号信息失败。 |
| 400 | InstancePermissionCheckFailed | An error occurred while validating the permissions of the instance. Please verify the account that created the instance and its permissions settings. | 实例权限校验失败，请确认云消息队列 MQTT 版实例的所属关系以及授权策略。 |
| 500 | InternalError | An error occurred while processing your request. Try again later. | 云消息队列 MQTT 版后端服务异常，请重试。 |
| 400 | ParameterCheckFailed | An error occurred while validating the parameters. The parameters may be missing or invalid. | 参数校验失败，可能缺失或者传入值非法。 |
| 400 | PermissionCheckFailed | An error occurred while validating the resource permissions. Please check the account that created the instance, topic, and GroupId, and check their permission settings. | 资源权限校验失败，请检查实例、Topic和Group ID的所属权限和授权策略。 |
| 500 | SystemOverFlow | An error occurred while processing your request. Please try again. | 系统限流，请重试。 |
| 400 | InvalidParameter.%s | An error occurred while validating the parameter. The parameter may be missing or invalid. | 参数校验失败，可能缺失或者传入值非法。 |
Group ID相关错误码
| HttpCode | 错误码 | 错误信息 | 描述 |
|---|---|---|---|
| 500 | CreateGroupIdError | Failed to create GroupId. Try again later. | 创建Group ID请求执行失败，请稍后重试。 |
| 400 | GroupIdAlreadyExsited | The specified GroupId already exists. | 当前Group ID已经存在。 |
| 400 | GroupIdAlreadyUsedByOtherUsers | The current GroupId is used by another user. Please change to a different GroupId. | 当前Group ID已经被其他用户占用，请更换其他名称。 |
| 500 | InternalError | An error occurred while processing your request. Try again later. | 云消息队列 MQTT 版后端服务异常，请重试。 |
| 400 | ParameterFieldCheckFailed | Failed to validate the parameters. The parameters may be missing or invalid. | 参数校验失败，可能缺失或者传入值非法。 |
| 400 | InstancePermissionCheckFailed | An error occurred while validating the permissions of the instance. Please verify the account that created the instance and its permissions settings. | 实例权限校验失败，请确认云消息队列 MQTT 版实例的所属关系以及授权策略。 |
| 400 | InstanceNotFound | Failed to find the instance. The instanceId may be invalid. | 无法找到实例。 |
| 400 | PermissionCheckFailed | An error occurred while validating the resource permissions. Please check the account that created the instance, topic, and GroupId, and check their permission settings. | 资源权限校验失败，请检查实例、Topic和Group ID的所属权限和授权策略。 |
访问错误中心查看更多错误码。