Hi @jgill,
Welcome to the Auth0 Community and thank you for your post !
From what i was able to check, unfortunately this seems to be a limitation of the Classic Universal Login, as mentioned in our Knowledge Article as well.
The workaround would be indeed using the Universal Login, for which case the friendly name of the tenant shows in the Authenticator App, but of course it’s up to you if you are willing to make this change.
Given the facts of the case, I definitely encourage you to create a Product Feedback of this issue and receive multiple votes so our engineering can take this into consideration and implement it in the future!
Thanks,
Remus