I am not sure because I don't use IOS but this thread had a couple of suggestions-- https://www.chess.com/forum/view/help-support/no-sound-ios-app
Time warnings in “settings”
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I am not sure because I don't use IOS but this thread had a couple of suggestions-- https://www.chess.com/forum/view/help-support/no-sound-ios-app
If you need help, please contact our Help and Support team.
Cheers!