Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello, I’m Virginia, I have 20 years of expertise in fixing my own & friends’ PC problems.
Sorry to hear you’re experiencing problems.
When you installed the authenticator app you have the option of restoring from a backup which is underneath the set up an account/sign in, did this option appear? It is small so can be missed.
If iCloud backup is enabled then this should be included in the backup if selected.
You may have to uninstall the app then install it to see this option.