CloudShell: Unable to start the environment - CREATION_FAILED

【以下的问题经过翻译处理】 我是一个AWS新用户。这是我第一次尝试启动CloudShell。我得到以下错误：

Unable to start the environment. To retry, refresh the browser or restart by selecting Actions, Restart AWS CloudShell. System error: Environment was in state: CREATION_FAILED. Expected environment to be in state: RUNNING. To retry, refresh the browser or restart by selecting Actions, Restart AWS CloudShell.

我尝试使用root用户和具有AdministratorAccess权限的非root用户登录后运行CloudShell。我尝试了policy simulator，它表示该用户应该具有访问CloudShell的权限。我尝试在Firefox和Chrome上运行CloudShell。我还尝试更改地区，但每次都收到相同的错误信息。

我在这里看到了几篇类似的帖子，但没有一篇似乎得到了解决：

https://repost.aws/questions/QUe4pWoMP2TqGDW6f4CXomvA/can-not-start-cloud-shell https://repost.aws/questions/QUPaqlvTw2RHi7OTrPVCzLsg/cloudshell-wont-start https://repost.aws/questions/QUufc-elFvSvqYlbJw95RI6Q/unable-to-start-the-environment-to-retry-refresh-the-browser-or-restart-by-selecting-actions-restart-aws-cloud-shell https://repost.aws/questions/QUH54A371dRvej5J1G_yZogw/error-when-launching-aws-cloud-shell-unable-to-start-the-environment https://repost.aws/questions/QUl4tcVsElQZGEpnJ7JaCJfw/unable-to-start-cloudshell

有人知道这可能是什么原因吗？