Using Outlook for Android for personal email and calendar management
Hello, thank you for reaching out to Microsoft Q&A.
Did you check your email forwarding rules to confirm that your incoming emails are not being forwarded to any other address?
Forwarding and IMAP:
https://outlook.live.com/mail/0/options/mail/forwarding
Also, try resetting your Microsoft account password.
Please use the following link to reset the password: https://account.live.com/ResetPassword.aspx
Let me know how it goes.