You should not generate a certificate. A SSH key is generated on the command line using the following command:ssh-keygen -t ed25519If you use putty, you can use the puttygen tool to generate a new key pair.
It usually asks if you reconfigure an interface.
I don't know how it is called in your language but you should use the export certificate button which does NOT include the private key.
The thirth certificate will be a server certificate signed by the intermediate CA we just created. This will also be the last one we create for this chain.
I quote from the wikiQuoteThe thirth certificate will be a server certificate signed by the intermediate CA we just created. This will also be the last one we create for this chain.The certificate you have generated is neither a server or a CA.Greetings, mark