Hi - yes, so as you guessed and @Raik pointed out, most likely your Bangle.js doesn't have a piezo in.
The default setting (in any firmware from the last few months) is to make noise using the vibration motor (Vibrate in settings) - but if you change it to Piezo and there is no piezo then you won't get sound.
I know it's not a huge consolation, but if you do have a watch with a Piezo and you flip between the two settings, there's really not a great deal of difference in volume - the sound just isn't desperately loud on these.
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