@Hunter9676, For your scenario, I have the following suggestions for you.
1, You can access to https://myaccount.microsoft.com/ with your account and update your security info to see if it could remove the previous the Microsoft Authenticator authentication and add again with a new Phone.
2, You can contact our dedicated data protection support team directly for assistance. You can find the support phone numbers by country or region here: https://learn.microsoft.com/en-us/microsoft-365/admin/support-contact-info?view=o365-worldwide .
3, You can post a new thread and add tag "Microsoft Entra ID" to see if they can help you open case to reset your authentication.
Hope the above suggestion can help.
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