Hi, Robert8899
Good day!
Thanks for posting into our community. We're glad to assist you.
According to your description, I'm sorry to hear that you're having trouble with the Authenticator app on your new phone.
As Microsoft has specific support channel resource for certain different support scope and attributes. Since we're focusing on Exchange Online, could you please redirect into the Microsoft Authenticator dedicating team - Microsoft Authenticator Tech Support which they have rich experience and more resources for this issue. We believe they would conduct in-depth of the given issue and provide you a more professional suggestion.
Thanks for your understanding and cooperation.
Sincerely,
Microsoft Community Moderator.