I have been trying to make pass-through work on the ARC-XCI55AX but it just does not. My Asus AX3000 modem reports that WAN lease time is 60 seconds. Eventually, Asus stops serving wireless and wired clients. I have used this router for the last 3-4 years with Xfinity without any issues. To roll out Asus router I pulled out my old Netgear R7000 and within a day I got the same result. I switched ARC-XCI55AX in DMZ working with Asus now and everything is better except now I'm double natting.
Verizon needs to fix firmware on ARC-XCI55AX and make it true bridge mode.
Please fix it.