Usertesting notification sound missing

I always had a sound notification when new test is available, however in the past couple of months - there is no sound. I checked setting and there is still a check mark for the sound notification.
I am not sure why there is no sound

Anyone had similar issue?
P.S. my primary browser is firefox.

submitted by /u/NumerousAsparagus
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source https://www.reddit.com/r/beermoney/comments/coaoun/usertesting_notification_sound_missing/