After setting up the domain we changed the nameservers to the cloudflare ones. only the 2 cloudlfare nameservers are set. But cloudflare shows “invalid nameservers” in the setup status. Any ideas why this happens?
I checked on the Denic website (registry for .de domains) and it seems to be set up correctly Nameserver Check - DENIC eG.
since 4 days we are still receiving the message that the nameservers are invalid. Even though we entered the ones we got after setting up the domain. Any ideas?
checked on the denic website if the servers are entered correctly. see screenshot
Are you sure you’ve changed your domain nameservers at your domain registrar? 
Looks like domain still uses old nameservers:
Domain: kibi-institut.de
Nserver: ns1.your-server.de
Nserver: ns3.second-ns.de
Nserver: ns.second-ns.com
Status: connect
Changed: 2024-11-29T11:52:12+01:00
Thank you for checking. This is strange. The nameservers where changed 4 days ago and when I check or use the denic tool (as in the screenshot) it shows me the new ones.
host -t ns kibi-institut.de
kibi-institut.de name server christian.ns.cloudflare.com.
kibi-institut.de name server dalary.ns.cloudflare.com.
You have added the Cloudflare nameservers as NS records to your DNS, which is not correct…
https://cf.sjr.dev/tools/check?22a1720e64694b08b5b5c2fe6dbdfe9b#dns
As @fritex says, you need to remove the 3 original nameservers and use the 2 allocated Cloudflare nameservers instead.
Thank you guys, this was so helpful!
Works now 
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