12.1 broke Wi-Fi calling on other devices?

I'm running public 12.1 beta. Since the latest upgrade, Wi-Fi calling on other devices is no longer available. The toggle is still there on the iPhone X, and can be disabled/re-enabled, but the Wi-Fi toggles no longer appear on the iPad or the MBP. Calls from iPhone toggles are still available, and that feature still works. I've attempted all the usual fixes, like flipping the toggles, restarting all devices, signing out of FaceTime, iCloud, etc. - no joy so far. On T-Mobile. Anyone else have this problem? Any fixes? Thanks.