Office 0xC004F06C: the KMS request timestamp is invalid (clock skew)
Error 0xC004F06C means the client clock is too far from the KMS host clock. Here is the four-hour rule and the exact fix for the time drift.
0xC004F06C and 0x80072F8F: Clock Skew Is Blocking KMS Activation
Windows returns 0xC004F06C when client and KMS clocks differ by more than four hours. Learn how to resync time and clear the related trusted-time errors.