Cisco Anyconnect VPN, new XB8 modem, higher speed 2GB lost ability to login to VPN (W11 Enterprise)

I am able to login to VPN from various other networks including a hotspot on my smartphone. So the issue is Xfinity + router. XB8 has little in terms of what is configurable so I tried a Nighthawk CAX80- plenty of “dials”- nothing worked. Getting the message Login Failed.  I cannot touch anything on my laptop- corporate policy. 
Was running same VPN with no issues on the same laptop for 2 years. Previous Xfinity service was 0.8GB with a CAX30 combo.