@Tony Ok, that solved the problem. I didn't understand the distinction between bridge and access point. I set it up as an AP, and perhaps unwisely used the same SSID and password as the main router,...

@Tony Ok, thanks. I don't think the C7 has an AP setting. So I gave it the 192.68.1.2. IP address, disabled DHCP, did this setting (enable WDS bridging) and put in the password (blacked out) to the...

@Tony To follow up: I just tried the password on the C7 router sticker and it worked! But that makes me think I didn't really set up an access point with the FIOS wifi, I just have a router with its...

@Tony Thanks for your response. Unfortunately I still get the "incorrect password" error. This time I set the C7's IP to 192.168.1.2 (the FIOS modem's is 192.168.1.1). I also gave a different name to...

I attempted to set up my old AC1750 as an access point with my Verizon FiOS Quantum Gateway modem, following the instructions here to set up WDS bridging. I thought I had done this successfully once...