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WiFi Calling and VoLTE in United States on TMobile

Star I
Having an issue on Zenphone 8 with TMobile in USA. I am unable to configure WiFi Calling, and VoLTE shows that I "Need to Register with operator in in order to enable this service" How do I get one of these to work, or are these even an option. Right now my service on TMobile is horrible, and they are stating it is the phone.
Also, I live in an area with great signal, 4 bars at my house, but calls still drop and the other party usually can't here me.

Rising Star II
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