If you are using Microsoft Office 2016 and getting the error code 0X8004FC12 at the time of activation, then here is a solution to fix this issue. In most of the cases, I tried uninstalling office completely and reinstalled it in administrator account and it fixed this issue but if you still face this error code and want to resolve it, then use the following methods:
1. Temporarily disable your antivirus and disable your windows firewall and try activating office, it should get activated.
2. If the above option didn't work, then reset your TCP/IP by running the official fixit tool by Microsoft. Download the fixit from this link and run it. Now try to activate your office program.
3. If you still face activation issue, then open the command prompt with administrative rights and run the following commands:
net localgroup Administrators localservice /addNow restart the computer and then try reactivating office again. It should be activated and you should not see any error messages.
fsutil resource setautoreset true C:\
netsh int ip reset resetlog.txt
4. If the issue is still not resolved, then follow these steps to enable TLS 1.2:
> Open RUN by pressing Windows key + R
> In the run box, type inetcpl.cpl and click OK.
> It will open Internet Properties, click Advanced tab.
> In the list of the available options, scroll down tillthe end and enable Use TLS 1.2 if it is unchecked.
> Now click Apply then OK.
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