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Hi 孟立 楊,
Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.
May I know if you are referring to Outlook? Are you using the Outlook app or the web version? Have you also checked if you have an available Outlook update? For this, I recommend checking via the Outlook online version at www.outlook.com, then try signing in to your account to see if you encounter any issues. If you can sign in without problems, it might be an issue with the app. I would recommend trying to reinstall your Outlook app to see if it resolves the issue. We, the community users, are always here to help. Thank you!
Your understanding and patience will be highly appreciated. Let me know if you have any further questions. Be safe always!
Best Regards,
Leo