Hi Ovidiu and Fabian,
with respect to your conclusion "pveproxy-ssl" vs "pve-ssl":
Shouldn't this also be reflected within the documentations's "CAs other than Let's Encrypt" section? The description here is talking about "pve-ssl.pem" and "pve-ssl.key" but not about "pveproxy-ssl.key" and "pveproxy-ssl.pem".
This could explain why I have still issues .. or did I misunderstood sth?
Greets,
Simon