GitLab.com Lets Encrypt certificate is not created

Hello,

I registered my domain yesterday at GitLab Pages and waited until today to get an SSL certificate for it. Unfortunately, only the *.gitlab.io certificate is issued, so the browser shows an error.

Force HTTPS is selected but disabled

and for my domain the automatic certificate management with Let’s Encrypt is selected.

Is there anything else I need to do?

As described in the following article, I once deleted the domain and created a new one, then a certificate was issued.