How can I change my phone number

Dear @Fabiha Nawar,

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

If your phone number changed and you can’t sign in to your Microsoft account, therefore, here are some steps I recommend you try:

Note: Please know you’re not alone in this, and we’ll guide you through every step to get you back in control as quickly as possible.

Based on your question, I can see your account is tagged as an education account. Therefore, 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’s IT administrator. They can help you update your phone number and reset your authentication methods in the system. This is usually the fastest and most secure way to regain access.

For that reason, the school IT admin can Reset password, 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 

Step 3: Change Phone Number

When user can sign-in, they can add or edit their own authentication methods in My Sign Ins | Security info. For example, to change the phone number, select Phone number and tap Change.

Note: Please understand that as forum moderators, our primary goal is to provide helpful guidance and support through general troubleshooting steps. While we don’t have access to internal systems or administrative tools required to resolve account-specific or backend issues, we truly appreciate your understanding of these limitations. We genuinely hope the information we share helps guide you in the right direction, and we're always here to assist as much as we can within our scope. 

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. If I misunderstand anything, please feel free to reach out.

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.