I have a watermark in the bottom right corner of my screen saying 'Activate Windows'

Marley1

Bit poster
I have bought a year of Parallels Desktop for Mac Pro but everytime I try to activate windows in the settings it asks me for a 25 character product key when I was given a 30 character product key so I can't get rid of the watermark, has anyone had this issue or can anyone help?
 
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