RT-AX88U on one website cannot sign in

[431microdot]

I have not had any problems with my router since I bought it, but now. My wife used to be able to sign to Arkansas Blue Cross Blue Shield, but the last couple of months, we can go to the login page but cannot enter any info. This is the only website that has that problem. We can bypass the router and plug in straight to the modem and have no problem. Running through a Nighthawk AX5, we have no trouble. I am hoping someone may know what to check. Routers have gotten too complicated for my old brain. Any help would be appreciated. Th;anks

 

[bennor]

What firmware is the router running?
Have you enabled any features like AiProtection or Parental Controls?
If running the Asus-Merlin firmware, are you running any addon scripts?
Are you running a DNS sinkhole like Pi-Hole on the local network?
What are the router (and clients) DNS settings?

 

[431microdot]

Give me a day or two and I will get back to you. Thanks for the reply.