Can you try adding an e911 address to your phone number?
- go to my.t-mobile.com
- select the profile page
- select the e911 tab and apply it to the line (or across all lines).
This may not solve it and it may be that the "number" change caused an issue in that the new number isn't properly setup for the beta.
Let me know if that doesn't work... and if it doesn't I'll need one of the forum moderators to reach out to get the bugID (if you have it) and the phone number of the DIGITS talk and text only line (virtual line).
Done, still no change.