So, as the title suggests, my previous network made use of a UDM Pro connected directly to the ISP router. Everything was fine. I took advantage of an ISP offer of 5GB Down and 5GB Up for $150/month. With the sale, they threw in a free AXE 16000 router. The problem is that the UDM pro only allows me to access 940 Mbps through the 10GB connection. I have no idea why. 10GB SFP to the AXE 16000's 10GB port. Downloads are still limited to 940 Mbps. When I plug my PC straight into the AXE 16000, I get a 5GB download. 
 

So I'd like to have the UDM pro pick up a DHCP address from the AXE 16000 and place it on another network for my unifi protect and unifi AP's. I have another 10GB switch where I connect my server and PC so that I can use the entire 5GB wired into the AXE 16000 Lan port.

All I want to do is set up a new network with all of my unifi gear on it. Is that something that the UDM pro can do? I put the UDM's WAN port into a LAN port on the router, but it merely says "No internet detected."
 

Thank You In Advance,