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Hi Kaidou, Aggeliki (contracted)

Please note that we are not Microsoft support, and this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, do not have backend access and cannot directly intervene in Microsoft products or features. Our role is limited to providing technical guidance and best practice recommendations based on reported issues, requests, or ideas.

May I confirm whether the account involved is a personal Microsoft account subscription or a business/organizational account?

If this is a business account, I recommend contacting your organization's IT administrator, as they typically have the necessary permissions to assist with re-registering your multi-factor authentication (MFA) methods.

For additional information, please refer to: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |… 

If this is related to a personal Microsoft account, you will need to contact Microsoft Support directly using a secondary account through the following page: https://support.microsoft.com/home/contact?SourceApp=smc2&ContactUsExperienceEntryPointAssetId=S.HP.SMC-HOME

I hope this information provides additional insight and helps point you in the right direction.

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