When i send a notification,it doesn’t have any sound.
I tried and it do the sound on my phone…
Which phone are you using?
p.s.
Maybe your phone is in vibration mode 
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Mi note3 Android7.1.1,other app have sound
It has been a long time since the last answer. But it still has this error. (from 1.0.1 to 1.0.5)
This is my block
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