Martin,
You are not doing anything wrong. We are experiencing the same problem. Symantec is experiencing a problem in their systems where new orders entered into the extranet site is not properly registering the serial numbers into the licensing portal.
I tried calling yesterday about this issue and there was a message talking about a known issue with the licensing portal site and that it was being worked on. There was a two hour hold period.
I called first thing this morning and got through with a representative. They said they were aware of the problem and would notifty us by email within 48-72 hours with a solution.
You can either call in to support and log a ticket or wait a couple days for the problem to become resolved.
Our vendor is SHI, so its not just CDW customers.
The only other thing I would suggest is to ensure that once logged in, you choose to enter only the serial with the ' do not currently have a customer number' radio button, but that likely wont work.
We have just went ahead and installed in evaluation mode since its good for sixty days. Once the licensing serial numbers are straightened out you can simply enter your serial to change from eval to licensed mode.
