The detail that gives it away is the generic VK7JG key on the old PC. That means Windows never had a real Pro key installed there. It was activated by a digital entitlement, and that almost always comes from the free upgrade from Windows 7/8, or an old Insider or upgrade promo. The slmgr channel can still say Retail in those cases, which is confusing.
Those upgrade entitlements are tied to the original hardware. That’s why the troubleshooter has nothing to offer for the new board. There’s no actual transferable license behind it.
If you do have a real Windows 10 Pro retail key somewhere (box, email receipt), put that in on the new PC via Settings > System > Activation > Change product key. If it says it’s already in use, run slui 4 for phone activation and explain you moved it. If all you ever had was the upgrade, unfortunately the new PC needs its own license.