Hello
When you add domain name, you need choose his owner. Does this owner have limit of domain name?
That's possible that when you created a domain (WWW-domains), a domain name and mail domain were added automatically.
Then you deleted only domain name. But www-domain and mail domain were kept. In this case you can't add this name.
You may use the global search in the panel to find which items are created in the panel.
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