can't change my phone number to get a new code

Question

I have changed my number and I can't access my school account and I can't get the code since it is linked to my old number.

Answer 1

Dear @Antonio Soriano,

Thank you for posting your question in the Microsoft Q&A forum.

Based on your description, may I please double confirm if the account in question is a Microsoft 365 educational account which is provided by your college/institution?  

In the meantime, to access to your school account again, here are some steps I recommend you try: 

Step 1: When signing in, please try to look for options like "Other ways to sign in":

Step 2: Contact your school IT staff directly

If the issue still persists, since you are using an education account, and your school has an MFA setting for your account, I highly recommend you contact your school IT staff directly so that they may reset your MFA settings to your new mobile number. You might also ask whether your MFA can be temporarily disabled to allow an emergency sign-in.   

For that reason, the school IT admin can Revoke MFA sessions and require re-registration in Microsoft Entra admin center  

For more information and instruction, please ask the school IT Admin to follow the Microsoft Official Guide here: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID | Microsoft Learn 

Note: Please understand that as forum moderator, I don’t have access to the backend systems to troubleshoot this effectively due to privacy and security constraints. I am just organizing use cases and collecting data, including from you, on a daily basis and will continue to monitor the progress of this issue.

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.

Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out.

I'm looking forward for your reply.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.