@Joseph-TP I used the drop down so there should be no issue of typographical errors or the like. I'd provide a link to the article to where quad9 disabled http 1.1 for DoH; however, the forum said I...

@Joseph-TP Do you know if the BE800 is using HTTP/1.1 for DoH inquieries? I've noticed that DoH queries to any of the Quad9 addresses do not work. I did find this article about this not being...

@5Guru I'm not having any issues with WiFi7. I'm also not having any issues with speedtest.net.

@Joseph-TP I did send it. This is the title that I received back - [TP-Link Support]-[TKID260331878] [Forum Escalation][ID 855734] Archer BE800-v1-1.4.1 Pre-release failed to auto access IPv6 address

@stbrown The BE800 at initial value is a more high-end device. It's odd that the BE550 is offering newer and better features for the new firmware that I'd expect to be with the BD800. Great questions...

@Joseph-TP the issue is the router getting and IPv6 address. My client devices do get an address. I have Altafiber (Cincinnati Bell)