Certificate with some subject Alternative names

Hopefully one off you, can help me to create a new certificate, with a couple subject alternative names in it.
For example:

I’m able to create a openssl request file, with all alternative names on it
And when I complete the request with the following command
univention-certificate sign -request SAN.certificate.csr it create a new certificate, with all alternative names in it.
But it didn’t create an new private.key, and

found the solution from https://forge.univention.org/bugzilla/show_bug.cgi?id=44312