Just moved, took Netgear modem and orbi 850s to new home. Orbi won't recognize Internet.

something to keep in mind is that the cm1150v has 4x ethernet ports. But with xfinity, only 1 device can be connected to it because they only assign 1 public ip address. 

So try this. 

Disconnect everything from the router and the modem. (even coax from modem)

then power them both down for 10 minutes. 

connect coax back to the modem and power it on. 

Wait 2-3 minutes for it to fully boot. 

Plug port 1 on the modem into the wan port on the router. 

Boot up the router. Give it a couple minutes to fully boot. 

Attempt setup on the ethernet connection in the router. 

make sure nothing else gets plugged into the cm1150v