Hello SchelCarpenter,
The Microsoft Authenticator app falls under the Azure umbrella but i think this resource should be of help: Add personal Microsoft accounts to the Microsoft Authenticator app - Microsoft Support
You should be able to add the same account to a secondary phone unless strictly disallowed by IT policy.
If you have any further questions on this please create an azure support request here: How to create an Azure support request - Azure supportability | Microsoft Learn
Thanks,