VPN (SonicWall) will not connect over T-mobile 5G Hotspot

I'm having this issue now too. Used to work fine on my Pixel 5.. not sure I ever used it on the P6, and now have a P7Pro. 

My IPSEC VPN (Global Protect) will not work over the hotspot. It shows connected, but attempts to access anything internal behind the VPN go nowhere. External access to CNN, Google, etc. work fine. 

If I set the VPN client to use SSL only, it works. And of course everything works fine from a land-based OSP. 

Tmobile - really need an answer here. My phone is on a business account and I need to be able to access my corporate VPN via hotspot. This is ridiculous.