Ok...So I have gotten it to activate, but this is clearly not the way I should have to do it. What I did:
I turned off my airport (macbook pro that is wireless)
Entered my serial number
Took me to a screen that said I was not connected to the internet would I like to activate (then it listed three options.)
I choose the with a web browser on this machine.
Gave me a link to e-seller
Turned back on my airport
Clicked the link
Took me to page with my installation id already filled in.
Submited the id.
Gave me a long activation number.
Pasted this in the gave
Told me the game was activated
Then clicked the activate button again on the bottom left (since it was till there.)
Entered Serial Number again.
This time.......
SUCCESSS
I assume this is not is what is suppose to happen, so I think you have some issue with the mac activation.