Asus router: "Your ISP's DHCP does not function properly"

Hi,

I upgraded an Asus router from RT-AC1750 to RT-AX58U and I'm not able to connect to the internet as it says "Your ISP's DHCP does not function properly". I've tried using a static IP, but then it just says disconnected. I've also done a factory reset and that did not work either. I have also tried changing DHCP query frequency to Normal or Continuous mode instead of Aggressive. I have also tried disabling NAT and UPnP, but that doesn't work either. My modem is getting a stable connection when plugged locally. And lastly, I am able to ping to the default gateway.

I hear that Asus routers tend to have issues with Xfinity, so any help would be appreciated.

Thanks

EDIT: A detail I forgot to mention is that I have performed a firmware update to the latest version, as well.