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).
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I came across this looking for the same issue happening on my tablet. If you’re using brave browser, turn off the shields at the login screen. Avast’s browser probably has a similar functionality and that’s what caused the OP’s issue. Reading this led me to the answer.
Confirming I had the same issue until I switched my default browser to Chrome. It seems the mobile Firefox app has issues and I only use it because you can use the Ublock Origin addon with it.
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This problem still exists and switching to default browser does not fix it.
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Yeah I was having the same problem here. But I managed to make it happen by when I got the agree page, i clicked on the dots at the top right and asked it to open it in Chrome browser instead of whatever it was opening it in. And I had to accept twice, but it got me through! Hope that helps someone.
Same problem here. I had to go to settings and changed my default to bing, try to log in, went through same cycle, but then changed back to Chrome as a default and finally seemed to work. The strange part was, when i was trying to log in via Bing, I received an approve on my 2FA and was able to allow. I also turned my Wifi of and went to cellular, but have the same provider. So not sure what part fixed it, or Maybe Battle.net did something to fix their issue in the background at the same time of me troubleshooting. A friend of mine had the issue at the same time, but he keot trying and going through the cycle till it worked.
Hope this helps someone
Found this while also searching for help. To no one’s surprise it was absolutely no use going through the support articles. Encountered this issue on my Samsung Note 9, (Android 10). My default browser was set to Firefox because I detest Chrome. Set it back to the default Samsung Internet browser and this did the trick. What a sad excuse for an app in the year 2023. At least there was a workaround. Too bad it wasn’t in the support articles 
Anyway, thank you for noting what worked and hopefully my input helps at least one other person.
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Experiencing this right now. This is absolutely terrible, it doesn’t make the process any safer if I have to enter and send the password numerous times. The setup in this manner takes way too long. And to be honest I expected that, I knew why I didn’t want to set up the app, and my expectation was fully fulfilled. You haven’t made it a slick and easy process, it’s a nightmare for imagine someone with disabilities, unbearable to be stuck in this endless login loop, nothing goes, not straight-forward, hate it.
E.g.: Why does the battle-net mobile app, which itself is the authenticator, ask me for the code from the authenticator, when logging into it (the mobile app), when it isn’t available. ??? why is the authenticator not able to be used in the background then
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I found this thread through google since I finally decided to sit down and try to fix this annoying issue
I was using Firefox before and it would stay stuck on logging in
I set my default browser to Chrome and was able to login just fine
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Thank you! I was in this exact situation, and this fixed it.
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I have the same problem - and it is not fixed, using Chrome is just a workaround (and an utterly unacceptable one).
Blizzard, fix your shiz.
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It is July 2nd, 2024, and this problem still is not fixed.
I use Firefox on my android devices. How is Firefox still unsupported? And how, this being the case, is Blizzard incompetent or careless enough to not even bother notifying users of this fact?
I switched my default to Chrome, signed in, and switched back to Firefox. It works now.
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I have the same problem.
When i use Firefox Klar i can log on via SMS authentification and get back to Battle.net App but then it says hmm, accept at the Authenticator. Which is implemented in the App i try to log in. Joking?
I just found this topic searching for a solution for this problem. The work-around with Chrome did the job for me.
It’s a shame, that other browsers cause a problem without saying the reason or an error code. I had this issues for a year. Very bad implementation of the app…
Switching to chrome, 1 being forced to is awful, and 2 didn’t actually work for me. full fresh install of it on my phone and set it to default and im still stuck in a loop. whatever I just had the new laptop battle.net i was logging into ask for a code from a text. This level of incompetency is so sad to see in this the year of our lord 20 gosh darn 24.
100% yes. This fixed the issue. I was ysing DuckDuckgo browser…installed chrome…changed it to default and gave it all permissions…boom…im in the app now
Same issue - chrome isnt an option for me so I use Firefox, but my phones native browser is the Samsung Internet browser, and for some reason neither are working for this - any work-arounds for Firefox yet?
I switched the default browser to chrome and am still stuck in the infinite log in loop. How am I even supposed to use this stupid battle.net app if it wont let people even simply log in. That’s ridiculous
I am currently having the same issue, but I have noticed when I start the app it does give me the notification “Oops something has gone wrong”, I feel the problem is with the app and not the actual sign-in process
was hoping for the answer here, but alast has not fixed mine
Same… I just got back from a vacation from WoW and found that I needed to do the install/authenticator migration bit. First thing I see is “Oops something has gone wrong” and of course the infinite loop. Tried all the suggested work arounds and nadda…
Glad to know Blizz is still on their game…