Dear Ahmed shalaby1,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
May I know whether the mailbox is a business mailbox or a personal mailbox (hotmail.com/Outlook.com)? If it's a business mailbox, and you are the sole administrator for your org, you need to contact our support team. You can reach them by visiting [Customer service phone numbers - Microsoft Support] and calling the provided support number.
If you are not the sole administrator or if you are a user, the most efficient way to solve this problem is to contact your org administrator. They will be able to assist you with resetting your authentication method then have a try again.
If it's a personal mailbox(Outlook.com/hotmail.com), please go to the following link for seeking help:
How to get support for Outlook.com - Microsoft Support
Best regards,
Katherine V - MSFT | Microsoft Community Support Specialist