While this issue isn't very common, it can be difficult to locate an acceptable solution that solves the issue of app license limbo in the Windows Store. It's also a bit of unclear what causes the problem As always, Microsoft is looking into the issue. However until a solution is discovered it is possible to use the following troubleshooting methods.
Microsoft Store Acquiring License Errors - Windows Store uses the same license that you use on the Windows Operating System. Sometimes, however, it happens that the Operating System reads the license perfectly, but the Store does not. In this instance it is the case that Window Store application remains stuck in the process of acquiring the license. The most important thing to know is the fact that Windows Store application needs to connect to the Internet to be able to comprehend the changes that occur and to perform its work. Make sure to connect your device to Internet and then try again.
