I am going around and around on this issue. I am stuck in the middle with my hosting saying NS1 / NS1 is validate and the IP is valid. My domain registrar is saying they are not. I delete my domain on Cloudflare so I can update anything.
You are telling contact my domain registrar which I have 4 times now. But they can’t see my NS1 or NS1 and my hosting is saying it valid.
Cloudflare is completely irrelevant at this point. As already mentioned you have to go to your registrar (where you registered the domain) and change the nameservers there and only there. Done.