EuroDNS domain .de wont accept Cloudflare DNS

Hello Cloudflare community. We are experiencing issues adding the Cloudflare DNS to .de domain in EuroDNS Domain provider.

After we apply the new DNS`s we are waiting for approval on their side, but in the end our request gets closed and they give us the following response:
"Some of the name servers you are trying to apply are misconfigured. You should contact your name server provider to solve this issue. "

Does anyone know what the reason for this issue can be, and is there a way we can fix this?

Thanks in advance to all.

Kind Regards,

Venelin Velev