Lost capability to text: Contacts show sip:[phone number]@msg.pc.tmobile.com;user=phone

I've had this happening for a while. The funny part is that I've talked to T Mobile, and they have stated that this problem has never been reported by anyone else in the history of Tmobile. Obviously, that's not true.

Same Issues as everyone here. It's one phone number that's causing the problem - a Metro customer in Florida specifically. The phone number shows up as that sip:[phone number]@msg.pc.tmobile.com;user=phone no matter what I do. I've switched to the Google messaging app, which seems to have fixed the issue. (Though I dislike the app)  I have tried the other troubleshooting methods aswell and they don't work at all.