Asus Router - Your ISP's DHCP is not functioning properly

I'm having the same issue as this thread https://forums.xfinity.com/t5/Your-Home-Network/Your-ISP-s-DHCP-is-not-functioning-properly-ASUS-router/m-p/3331178/highlight/true#M322290 I have my Xfinity router in bridge mode hooked up to an Asus RT-AC87U and my internet suddenly went out this morning and hasn't returned. I can connect to the Asus router fine and access my local network, but the Asus setup page says "Your ISP's DHCP is not functioning" under internet status. I wonder if it needs to be sent a provisioning signal, as in the linked thread? I've unplugged both routers several times, and used the online tool to reset the Xfinity router, and checked for outages, still nothing.