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Outlook
A family of Microsoft email and calendar products.
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Hi @Sky Chen
Welcome to our forum!
Looks like the issue is more related to Outlook for mobile. Please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In order to better solve your problem, it's suggested to post your issue on this dedicated forum for Outlook for Mobile for more professional help.
Based on my research, please kindly refer to this official document Error AADSTS50020 - User account from identity provider does not exist in tenant - Active Directory | Microsoft Learn.
Hope this helps!
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