Problem with sync'ing apps and authorization

Hiya,

So far I have just managed apps by downloading them on the phone. However I cannot syncronize the content with my iTunes. I have setup the same account on both the phone and iTunes.

iTunes keeps on saying that I should validate the my account. Fine, but when I enter my details (correct, of course) it says that I have used 2 out of 5 authorizations. When I click validate the same message keeps popping up.

I just can't see what the heck I'm doing wrong. Same account on both devices, and I obviously still have 3 auths left (whatever that is supposed to mean).

I would really like to be able to sync the apps with my iTunes and vice versa, so I'm able to download the apps from my laptop.

 

No one who's able to provide a little assistance with my humble request? :/