Steam AoE3 keys currently out of supply, will be a matter of days before they're resupplied.

Hey guys, quick announcement here. You will currently face some troubles if you've recently bought the game on Steam and are trying to install/play, as Steam is out of AoE3 CD keys and must wait for them to be resupplied from Microsoft's stashes.

Plus2Joe has confirmed in another thread that this problem should be sorted out within a few days.

I wouldn't worry about your purchase, this has happened several times in the past and always been resolved.