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