How to stop another user's authentication prompts to approve sign in from coming to my phone

Question

I setup a users outlook account up on a pc when doing so the MS authenticator app window popped up saying to "lets get you setup" I had to use my phone to do it and continue the sign in process and in doing so i used MY microsoft authenticator app for the inital setup before i sent his computer out, but now that he is trying to setup outlook on his PHONE, i keep getting approve sign in prompts on my phone still even though i removed his account from my Authenticator app instead of on his phone... I've tried revoking his authenticatrion sessions in azure and making him re-register in MFA as hell as have him remove and re-add the account but when he tries to sign into outlook on his phone the 'approve sign in' prompts are still coming to my phone. Any tips?

Answer 1

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 the correct device.

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