I asked Cloudflare to check the nameservers periodically, yet the status is still “invalid nameservers.” However, I checked the DNS checkers and found no issues with that.(attached screenshot) And the website is accessible.
What feature, service or problem is this related to?
You have set NS records in your DNS which is not the correct thing to do. Instead you need to remove the turhost.com nameservers set at your domain registrar and use the 2 allocated Cloudflare nameservers instead… https://cf.sjr.dev/tools/check?31113ce623884265afbfa764553bb84d#dns
