Hello Mohamed Amine Raggam,
Welcome to Microsoft Q&A forum.
I don't like to say this, however, judged by the photos, it could be possible that your account has been hacked and the alias has been changed. What you are seeing on your computer is a local cache.
Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas. In this case, please try to submit an account recovery form at aka.ms/recovermyaccount.
Thank you for your understanding.