phone number out of service

If this is a work or school account, update the sign-in verification phone number at https://mysignins.microsoft.com/ if access is still available:

1. Sign in.
2. Open Security info.
3. Find the old phone number and select Change.
4. Enter the new phone number and complete verification.

If sign-in is blocked because verification is still going to the old number, the organization’s IT help desk or Microsoft 365 admin must reset the MFA/authentication phone number.

If this is a personal Microsoft account, go to Manage how you sign in to Microsoft and add the new phone number first, make it primary if needed, then remove the old one. A primary alias cannot be removed until another email address or phone number exists on the account.

If access to the old verification methods is completely lost on a personal account, select “I don’t have any of these” during sign-in to start account recovery. Microsoft allows adding new contact information through that process, but it includes a 30-day waiting period.

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