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

Hopefully this helps someone else.  I had this same problem with my s21 5g phone.  I saw a suggestion to switch to 3G.  Poof.  I immediately connected to my work VPN.  I was then able to switch my phone back to 5G and stay connected.  The next time I tried I left it on 5G and it worked.  I don't know the technical reason, but it seemed like it somehow couldn't pass the VPN security while on 5G, but after connecting once, it's all good.  Maybe someone else can explain better, but worked for me.