Why doesn't Cloudflare's DNS work for my router?

Question

Computer networks

The computer is connected to the router via a cable. In the router settings, I added DNS from cloudflare:

spoiler

But I don't get verified by the link https://www.cloudflare.com/ssl/encrypted-sni/ :

spoiler

If I add DNS in the Windows network settings (in network connections), then I pass the test:

spoiler

Explain why the settings in the router are not enough? I suspect that I'm missing something serious in the operation of routers.

Answer 1

He works. It's just that your router does not support Secure DNS, so there are regular requests to Cloudflare DNS.
Torment tp-link technical support.