I ran into the same exact problem and was hoping to find out what is wrong with this.
Happy birthday giveaway bugged
You try to start the quest and the pin provided is not valid. Thank you for the birthday gift Alienware!
the cake is indeed a lie
the cake is indeed a lieedited 1h
Damn GlaDOS tricked us again, that bastard! :D
Yep it is bugged. I was looking for this post for reassurance. Thanks
We're looking into it guys. We'll check the logs to see who played and make sure you get your rewards.
Should be working now.
working, thanks Cartire
Can confirm that it is working.
Fixed and working, thanks for the quick support on it.