I have 2 computers which I installed the same license key too. I have multiple licenses, so I wish to fix this situation. I am getting those warnings on both my computers.
How can I fix this?
You should really contact Microsoft about this. However there are some workaround methods available (I've never tried them but they may work. Or not.):
There is a change product key if you bring up Properties.
Not sure if its still available for you.
Or try these: