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

Yeah, this worked on my P5. I am wondering if only newer phones are able to filter out this IPSEC based traffic? 

Either way, T-Mo needs to step up and at least answer why they are doing this, if not stop all together. It's insane that they would block a corporate user trying to VPN back to their corporate network to do some work, while allowing hotspot video streaming. Not sure what they are trying to accomplish here.