Motherboard change unable to reactivate Windows 10 Pro -

Well, I entered the Windows 7 key. It came back and told me that it could not be activated with that key. I started a chat with MS Customer Service - they asked the error messages that I received. I told them I would have to run the activation process again as I did not write down the error code. There was no activation option. No red warning to activate the product - so, it seems that it did activate with the Windows 7 install key. The MS support agent agreed. Will see what happens when I reboot.

Out of curiosity, what does it say under Activation in Settings?

Well, I'll look - I did find that after I rebooted I had to sign in with my MS account - I could not use the previous user name on the computer to log on - Inconvenient having to enter the password on my home computer - but.....

That should be no problem you'll only have to do it once. After that initial login on you can go back to using your local account. You got lucky getting this to activate be thankful.