Bose NC 700 missing feedback sounds when switching through ANC favorites

I've got the headphones 1 week ago and turned off the voice option (where a voice tells you your battery level etc. at start up) When switching through my ANC favorites (Button on the left), I've got feedback sounds (High, medium and low pitched beep). After a few days those sounds went missing and now its just silent, which is very confusing. All other sounds are still there, like when a device gets connected/disconnected etc.

 

I've already ..

  • Checked my software version at https://btu.bose.com/ (already up to date)
  • Did a reset of the headphones
  • Reinstalled the app and created a new account
  • Reached out to the Bose support, who couldn't help me

Is my device defective and should be returned?