If that is the case, then the only other possibilities I can think of would be an issue with your AppleID if you are using it, or perhaps this laptop is being managed by a school or business. Did you check out if the issue still persisted when you first logged into the clean install? Did you try testing the laptop by just creating just a local user account which was not tied to your AppleID?
How did you acquire the High Sierra installer? Did you use Recovery Mode (Command + R) or use an old version of the installer? If you used either of these methods, then it may be using a corrupted or damaged installer, or an installer that is tied to your AppleID. In theory installing macOS using Internet Recovery Mode (Command + Option + R) or from a bootable macOS USB installer should install an OS that is not associated with your AppleID as long as the whole physical drive was erased.
Did you use Internet Recovery Mode (Command + Option + R) or download & create a bootable macOS High Sierra installer from the most recent version of the installer available? This should be the best option and should not cause any problems.
Maybe you would have to disassociate your AppleID and accounts from this Mac like when you are preparing the Mac for sale as described in this Apple article:
What to do before you sell, give away, or trade in your Mac - Apple Support
This is the best I can suggest. Unfortunately some things may only be fixable with yet another clean install since once something has been activated it may not be possible (or at least not easy) to resolve. Hopefully another contributor will have some better ideas or insights for you.