thank you for your answer.
of course I did /usr/local/cpanel/cpkeyclt on the server some times.
But this is not working because no one has bought a license for the IP at Cpanel.
As I wrote before, this is also what cpanel support said.
They also said that neither bitnami or 1und1 are reseller partner of cpanel.
So I don't understand why you or 1and1 offer this service.
So the only way I see at the moment, is to cancel my subscription and buy a cpanel license by my own.
1und1 is ignoring my emails, because they say you are making the support for them.
This is frustrating and I am feeling cheated.