I understand the frustration. Here's what I found out on my own. The previous user name with Sprint is no longer your sign in. So pay close attention and not let the autofill do it. You will now have to use your FULL email address as your USERNAME. Then the password will probably need to be reset if you're not sure. But CS and tech won't grasp to tell you this. Good luck.
It's the log in... User name vs email. Sprint used a user name and let you move over to T-Mobile with that user name. But once they switched off Sprint, T-Mobile required the user name to be your email. Try one vs the other, but you may have to reset the password. Pay attention to any auto fill items.
I finally got a competent cs. They reset my T-Mobile app user name to log in with email and was able to log in after 5 months.
Yes. Can't log into T-Mobile app to manage account, says Sprint customer. Can't log into Sprint app, no longer an account, says T-Mobile customer. 3 tickets and I still can't log into the app since April.
Same here. I've filled 3 tickets with tech support since April. They act like they have no idea what you're talking about. The app is useless to former Sprint customers. You can't log in to manage. 🤷🏾
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