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Go to settings on facebook / apps and websites / and check whether the game is set to active.
To get the app back on the shortcut list, see the link
@afvb1956 Hi and welcome, i would try the above tips from @Werner_Cichy but if this does not work you will need to contact Facebook support regarding this as its on the Facebook app
Thank you
Much more fun to play the game on anything else than FB :)