MS Access 365 (Status: Product is unlicensed)

I installed the Access 365 in my PC, but the license status is "unlicensed".

I tried to type my License key and follow it's process, entered my register email address, and whole process is finished without any problem. (I am sure that the License Key matchs to the MS Access version)

However, the license status is still unlicensed, even I restarted the PC. 

What is the problem and how to solve it?