You may see this error while you’re trying to activate Windows after an update. See detail below:

Error description (your case may not the same but the solution for error code 0x8004FC12 is same):
error 0x8004FC12 Windows 10 Pro Build 10130

“On Windows 10 Pro Build 10130 I am getting Error code: 0x8004FC12 while trying to activate Windows. I updated to 10130 from 10122 and did a reset without deleting personal files and now I am not able to activate windows 10. There was no issue on Build 10122 and windows was activated. Still it shows that the correct Key for Pro build is there but can’t activate.”

Here’s the solution we found for you:
“So after investing another 30 mins doing packet captures, removing and re-adding keys with slmgr etc.. I thought I’d try phone activation using “slui 4”.  

All worked fine and now activated.. Not sure why it wasn’t working with online activation.”

This information may also help:
“After installing the Windows Updates that were available and restarting, my computer activated.”

Activate with the provided key:
“I activated on windows 10 developer preview build 9860, when i was downloading windows 10 technical preview 9840 they gave me key on that site. i used that key and now i m activated…”

Some steps you should follow if the above information does not help:
I have solve the same error with a simple two steps process:

1. Start services.msc
2. Restart Windows Update
3. Restart Windows Installer

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