After running Office 365 on my Windows machine for several months, a notification popped up saying that I was using an unauthorized or expired license. I was completely confused because I knew my license was legit and other machines that were using the same license seemed to work fine. After several hours of struggling to find the solution to my problem I stumbled upon this page by Deploy Windows.

I tried reactivating my license only to get an error that says:

We’re sorry, something went wrong and we can’t do this for you right now. Please try again later. (0x8004FC12)

The solution as explained by Deploy Windows is to do the following steps:

1. Change the NoAddingComponents registry key from 1 to 0 under HKLMSoftwareMicrosoftWindowsCurrentVersionPoliciesActiveDesktop
2. Change both the NoActiveDesktop and NoActiveDesktopChanges registry keys from 1 to 0 under HKLMSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorer
3. Open an elevated command prompt and run the following commands:

   net localgroup Administrators LocalService /add

   fsutil resource setautoreset true C:

   netsh int ip reset resetlog.txt

4. Open up one of the Microsoft Office applications and it will say that “Activation was successful” and then relaunch the Microsoft Application again and everything should work.

What a headache but now I can be productive again.