collieman,

WAIT. Don't do what I asked you. Not yet.
Please answer the follow question...........

You said " Never had a problem with the Win 7 activation using the key. "
What key is that ?...

1. Your profile says " Win 10 9926 ". That's Insider Preview build and a very old one. It came out on Jan 25th, 2015. I assume you have updated to at least a newer build since then ?

2. Failure to...