Wifi Calling Stuck at Enabling

Hi Guys,

The wifi calling feature on My T-mo Galaxy S6 is not working at all. Whenever I try to enable it, it gets stuck at enabling.

Toggling Wifi on/off or rebooting the phone has no effect.

Can anybody help?

BTW I am on G920TUVU2DOF8 build, rooted, TWRP recovery and UniKernel.

Thanks