You'll need the school admins to reset the account then a new QR code can be generated with which you can link up the authentication device to the account.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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When trying to log into my school account on Microsoft Authenticator it won’t let me log in unless I type in the code displayed in the app. However there is no code displayed in the app and even if there was I wouldn’t be able to read it and sign in.
You'll need the school admins to reset the account then a new QR code can be generated with which you can link up the authentication device to the account.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--