Thanks for reaching out and welcome to the Community.
We tested this on a couple devices at our end and got mixed results. This leads us to believe that this behavior is due to the way individual devices are configurated to handle music apps, when the smartphone is in silent mode. We'd recommend reaching out to the manufacturer for more info on how this setting can be changed.
Keep us posted on how things work out, we'll keep an eye out for your reply.
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards