Credential - User certificate - Erroneous Certificate

I’m trying to create a credential with a client certificate, but when I try to upload a RSA Certificate (with any kind of extension, like .cert, cert, txt, pub, pem…),

I get the error “Erroneous Certificate.”
But the same certificate works on Nessus.

Any help?

GSA Version 9.0.1~git-a2e4e3cd3-gsa-9.0

Plase note GVM is not nessus, and this is not in any relation with a Scan-Configuration. Please use the PEM format.

There is also a possible bug in the libssh library (if linked against libgcrypt) when using RSA: