Can't connect a T-Mobile home internet Sim to the gl-x750v2 despite previous attempts

Hello! I have just bought a new 4g LTE router from gl inet. I have been having some issues connecting my TMHI Sim to it despite doing everything mentioned in many previous posts with the same issue. Here's what I tried (mostly in order)

-Enable IPV6 (nat6)
-Spoofed IMEI of previous router
-Set TTL to 65/64
-Tried various APN's besides the fast.t-mobile.com APN. (and fbb.home)
-Attempted auto-connect with no luck
-Many restarts
Many resets

What did I do wrong here? Seems like it's a breeze for many other users to do.

Thanks!

To check this issue, can you share your device by following the steps below? Thanks
Technical Support via GoodCloud.tar (192 KB)