如何解决 STS 临时凭证报错 is not authorized to perform: sts:assumerole on resource？

中国区用户要获得临时凭证。根据如下链接操作时，报错，is not authorized to perform: sts:assumerole on resource 请问可能是何种问题呢？ [https://docs.aws.amazon.com/zh_cn/IAM/latest/UserGuide/id_credentials_temp.htm](https://docs.aws.amazon.com/zh_cn/IAM/latest/UserGuide/id_credentials_temp.html)