Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Robert,
Try to log in using the Phone number on the Microsoft Accounts page, as if the Phone number is linked to your account, it might permit you to sign in.
If you forgot your Microsoft account username, please refer to the following article:
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, please take a moment to rate the answer. Wishing you good luck!