I want to try the SuSe Manager 3.0
So I downloaded the server from the download center.

I booted from disc 1 and installed SLES 12 SP1.
After that I registrated the system with our registration code (for SLES).

Then I wanted to install the manager via YAST2->Addons.
The wizards asked for a additional registration code.
I entered the code I got for the evaluation, but it doesn't work (No valid registration key)

What I doing wrong?