You'll need the school admins to reset the account so a new QR code can be generated with which you can relink the authentication device to your account.
--please don't forget to close up the thread here by marking answer if the reply is helpful--
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I can login to my school microsoft account because i have the password but i could not amend its security info as i no longer have the authenticator app on my phone. I have lost it when i reformat my phone. Worst still, I do not know who is the PIC of this issue in my organisation. Can Microsoft team assist in this? I only need a reset and i can login using my password then redo everything.
You'll need the school admins to reset the account so a new QR code can be generated with which you can relink the authentication device to your account.
--please don't forget to close up the thread here by marking answer if the reply is helpful--