We send a message with firebase, but it plays no sound on the receiving devices.
A little bit more detail: we use it in a pwa-environment. When you use "add to homescreen" (pwa-default) it actually does play sound. But we also use it in an app, with pwabuilder, en in these apps no sound is played.
Create a pwa, than package it with pwabuilder and publish it. Push a test-notification to a device.
Add $message = $message->withDefaultSounds();.
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I added the patch to enable sound by default. It follows the device setting of course, so when sounds are muted a buzz is played, or nothing at all, depending on the user phone preference.
Also fixed some pipeline-things. Only composer next minor fails. Don't know why exactly.