Activate Windows pops up after latest Insider update

I am an Insider on the Fast pace for Active Development of Windows. 5 days ago, I had installed the latest Insider update released on 13th December, 2017 (Build:17063.rs_prerelease.171213-1610). After updating to that, Windows has been saying that my product license is not valid and is asking me to buy a genuine copy form the Store.

The error code is:

0x803F7001

Before this, everything was fine and Windows was activated. I bought this machine with Windows 10 pre-installed. Previously, this same problem had occurred in which Windows was not activated after installing an Insider patch, but it resolved itself in 2 days. How do I fix this?