Windows Upgrade Help and more

Agreed. This happened to me on my own PC. I fixed it by signing out of my Microsoft account in the activation settings, rebooting, and then signing back in to reactivate.

Quick tip: Oh yeah, that's a super common headache after a big upgrade. A lot of us have had to double-check those settings. If that error code keeps popping up, let me know and we can try a few fixes together.