Hi @Chunzhu Wang
I suggest that you speak to your Confluence or Atlassian Organization admin and/or contact Atlassian Support https://support.atlassian.com/contact/#/
Please note that this is a public self-help forum and we cannot access your site. Also, this being a public site, anyone on the internet can see your details so I'd refrain from sharing site and email addresses here.
Hello,
Welcome to Community
Please check this article that can help you out here : https://support.atlassian.com/confluence/kb/user-cant-access-confluence-cloud/
if you are still facing issues you can reach out to support https://support.atlassian.com/contact/#/
Thank You,
Prachi
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