Fitbit versa doesn't vibrate

Hi,

I recently switch from Sony SW2 for Fitbit Versa, the connection of the device with a smartwatch is ok, sleep monitoring with HR is ok, but the alarm on Fitbit doesn’t vibrate. Do I need any special settings or permission?

I’m using Fitbit versa 2 with Samsung Galaxy S8, app version 20200505.

Thanks for any suggestions,
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