Default [Q] Question:Get Wifi calling working on rooted/unlocked AT&T HTC ONE?

Got an AT&T HTC ONE, rooted, flashed ARHD (which has wifi calling when you select T-mobile under the setup), and it's been stuck on "enabling". For hours. Despite reboots and clearing cache in recovery, it's still hanging.

Suggestions on how to get it working? A search revealed it's possible, that is correct, right?