Hi @makeitrein !
This is a pretty frequent problem as mentioned in this article: [Support Guide] Are there rate limits when provisioning SSL/TLS certificates using Netlify?
In effect, we can make a partial certificate for you if your DNS is only partly propagated when you configure hostnames in our system, and the “fix” is to hit the “renew certificate” button in our UI, at the bottom of the Domain Settings page as shown in this screenshot:
In this case, I went ahead and renewed it for you, but for others who have this problem, you can self-solve (though DNS does need to be correctly configured and propagated first!).