I have a let's encrypt wildcard certificate for
Is it possible to use that certificate for
the-grue.de itself? Or do I have to use another certificate?
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No, you can't use this certificate to secure 2nd level domain. In order to secure the domain name itself and hosts within the domain, you need to get certificate with the following names in SAN extension:
DNS Name=example.com DNS Name=*.example.com
first entry secures the domain, second entry secures hosts within domain.