Is your account a school account or a personal Microsoft account?
- If it is a school account, I would suggest you contact your school IT for help, IT has the permission to add your device back. For more details, pelase refer to "Manage your work or school account connected devices from the Devices page".
- But if it is your personal Microsoft account, it's recommended to sign it in your Office back. If there is any error message, please let me know.
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