DECO S4

I have DECO S4 mesh. I just got Xfinity Router/Modem. If I change the S4 to Access Point I lose the internet on the S4 system. I have rebooted both and no luck. I reinstalled the Deco and no luck.

One other thing the Xfinity IP is 10.0.0.1 and the Deco is 192.168.68.01 if that helps.

Any help would be greatly appreciated.

Thanks in advance