Windows won't Activate on 'Parallels Desktop For Mac Business Edition'

MohamadM1

Bit poster
I bought Parallels Desktop For Mac Business Edition in July 2021 and since then I'm having troubles with Windows 10.
I see 'Activate Windows' on the bottom right corner of my desktop.
I entered my Windows product key as provided by my institution, I get the a message saying 'The product key you entered didn't work. Check the product key and try again, or enter a different one. (0x800f0805).'
I searched all the relevant articles from Windows, downloaded ISO files and still cannot fix this problem.

Your help is much appreciated

Thanks..
 
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