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Hello Kiara and thanks for your reply.
The page you gave me https://community.king.com/en/blog/discussion/247354/is-your-game-crashing-on-pc-facebook was written in 2018 and the link to check whether my browser is optimized does not work any more...
Still, I followed your advice and I downloaded the Windows app. I was able to sync with my Facebook account. Many thanks for the suggestion!