Update: We shouldn’t get many more calls regarding this as they have rolled back some of the changes until October: https://www.cnet.com/news/google-rolls-back-chrome-update-breaking-web-games/
We’ve had a few customers make this complaint. They are using Chrome. Latest update for Chrome auto-disables sound for some HTML5 sites that auto-play.
So Facebook gamers notice some games work (Flash ones) and some don’t (HTML5 ones).
In Chrome you can browse to chrome://flags/#autoplay-policy and set ‘no user gesture required’. Then restart Chrome and the issue will be fixed.