OpenVPN UDP Server partially works

I have an OpenVPN server UDP configuration that I’ve been using for several years. Among other things, it allows me to access my Netflix or Amazon shows while temporarily overseas.

I would like to switch to TMobile Home Internet, so to prepare I set up a UDP tunnel with LocalXpose so it would connect to my OpenVPN server.

This OpenVPN server and UDP tunnel works flawlessly with my Cox (cable ethernet) provider. Works the same as if I specified the IP address instead of the LocalXpose tunnel.

However, when I try it with TMobile HI, I get mixed results.

I am able to establish the VPN connection with no issues, but when I try to navigate to one of my Amazon shows, I can login to the service, navigate to the video, but it won’t let me play the video. No error message, just a spinning cursor waiting.

While it is doing this, the OpenVPN server doesn’t seem to have any traffic. I don’t know what the disconnect is.