I have raised a ticket however the proposed fixes (clearing cache in App and login page, uninstalling/reinstalling, restarting device, I have no ad-blockers knowingly installed on my phone) have not worked and the recommended action from Blizzard support was to raise a topic here!
When I open the app I get the login screen, enter my battle.net username password (as I do anywhere I need to login to WOW “stuff”) and I get the infinite cycle of login pages with multiple chrome windows opening on my Android phone. Very occasionally I get a Authenticator request (I still have Authenticator installed as clearly the Battle.net app is not fit for purpose) which I approve but nothing happens.
This is very frustrating, as several uses have mentioned in these forums already, as we are being told that Authenticator has moved to Battle.net but obviously this is going to be useless (and not secure) if I can’t actually login to the app.
So at the suggestion of the Blizzard Support ticket - here is my post! Has anyone been able to resolve this issue? I have seen posts about amending the URL but I can’t do this as the login page opens in a Chrome window which I cannot amend the URL.
EDIT For those interested I managed to resolve my issue (partly with support from Blizzard but only in passing); I was (again) advised to clear my cache etc but this time I noticed that Chrome had been replaced as my default browser (I have Avast AV which had installed its own browser and applied as default). So I switched my default browser back to Chrome and was able to login to the app and activate the Authenticator in the Battle.net Mobile app. So working for me (for now).