change old phone number to new phone number

Question

I got a new number and i can no longer access my old number so my account is asking for a code to my old number or thur the authenticator app and i cant access neither of them cause i dont have access to my old number

Answer 1

Assuming a work / school account.

https://mysignins.microsoft.com/security-info

1. Go to Security & Privacy page > choose Additional security verification > Update my phone numbers used for account security.
2. After that it will open a new window. You will see your Phone is listed and you can choose Delete.
3. Choose Set up Authenticator app and it will open a pop-up box with QR code so that you can configure the app on your new device.

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Answer 2

Then try signing in here to change your security info.

https://account.microsoft.com/

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