Windows Defender update error 0x80070643: security intelligence will not install
Defender error 0x80070643 blocks security intelligence updates and leaves detection stale. Here is the real cause and the fix that clears it.
Office 0x8007139F and 0xC0020017: the licensing service cannot reach the KMS host
Microsoft publishes 0x8007139F and 0xC0020017 as a KMS contact failure logged as Event ID 8198. Here is how to read that event and fix the cause.