Zoom not connecting through vpn

I’m using a Xfinity gateway with an Ethernet cord going to a third party vpn for work. Xfinity has packet loss on the vpn Ethernet connection. I had a different internet service provider installed and everything worked perfectly. I have switched gateways, replaced the vpn device, and the computer. Same issues. Xfinity seems to not be able to find a solution but I would rather much stay with Xfinity. Please someone help