T-Mobile Wifi calling NOT working

Your welcome.
It probably only allowed you to connect to 4gLTE because you still have to add you APN. If GL.iNet did the APN adding according to the standard then it would have appended your APN to the bottom of the generic MBN profile.
I know cuddy was following me with the issue and added a special check mark for the fix. When I looked at it the GUI check mark just did what I wrote out manually. It good to know the X3000 has this option, NOW if only GL.iNET would put that standard across the board because I have a PuliAX and it does NOT have that option check box in the GUI, errrrr.