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I take it none of the suggested troubleshoot has made a difference? https://care.king.com/en/candy-crush-saga/cant-get-your-games-to-load-on-facebook-check-this-out
If you have a printscreen button then it should work normally. If you have an 'Fn' button in between "Ctrl" & the Windows button, it'll be that one you need to press along with "PrntScrn".