I purchased a Power BI GCC license to start trying out the service. It works just find through the website, but when I attempt to log in to the mobile app it says, "Looks like you haven't yet turned on Power BI for your Office 365 account. To continue to your dashboards turn on Power BI then get started." I then click "Turn On" even though I know I already have it and it goes to the "sign up" website. If I attempt to sign up (again), it says "You're using [username] with another Microsoft service already. To finish signing up for Microsoft Power BI, sign in with your existing password.". Then nothing. Clicking "sign in" actually just signs me out.