hiya @Berkmann18 and sorry to be slow to get back to you! We don’t need your CSR - we need your certificate, from a vendor like Comodo. We are not an SSL provider! Your options to use SSL at Netlify are:
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let us get a certificate for you. we generate a CSR, and use the ACME protocol with Let’s Encrypt to get you a cert. We don’t need anything from you except to configure DNS to point to us, and then we’ll get a certificate assuming that you haven’t blocked it with things like DNS CAA records or misconfiguration (e.g. what is described in this thread about Cloudflare).
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bring your own certificate. You generate a CSR and key file, send to a vendor like comodo, they send you a certificate, which you upload. We never see your CSR; just your CA Chain, private key, and the certificate in PEM format.
You seem to be most of the way to #2 but I think you think we are going to make the cert for you, but in that case, we do not. You can abandon and let us generate instead for you, no harm no foul 