Hello @keith smith
Thanks for using Q & A forum.
You can delete your account from the Microsoft Authenticator app, and you can delete your device from your work or school account. Typically you delete your device to permanently remove a lost, stolen, or old device from your account, and you delete your account to try to fix some connection issues or to address an account change, such as a new user name.
To delete your account from the Microsoft Authenticator app
From the Microsoft Authenticator app, select the account you want to delete, then select Settings and Remove account.
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