Hi there!
Cain from the Uplay team here. I am the one responsible for making sure you have you game in your library (Providing you have been invited of course). Unfortunately, pushing the games out to those invited is taking a liiiiitle longer than expected but they are slowly but surely making their way out there.
I'm estimating at the current rate that it show up in less than 2 hours (Depending on how lucky you are) so keep your eyes peeled for the game showing up in your libraries.
Sorry for the inconvenience folks.
/Cain (Uplay Team)
UPDATE 20:45 UTC: The game should now be on everyone's account (If you were invited of course)