Photoshop tells me that my Subscription expired, but it's not.

Hey everyone. I have a really annoying problem. I have downloaded Photoshop via the Creative Cloud App and once I open it, it tells me that my Subscription is expired. I click on "Try again" and then it tells me, that it was activated successfully. Once I click continue it tells me again, that my subscription expired – This continues infinitely. I have fresh installed my System (OS X Yosemite) and tried it also on my other System. So what's the deal? I appreciate your help a lot!