unable to communicate to friends on the xbox app

for the last 2 weeks I have been unable to hear or talk to friends on the xbox app.My other laptop runs the app perfectly(but cant play games) and my tablet also works fine.The problem seems confined to my gaming laptop.The mic works as do the speakers
and the app has permission to use them.have reset the app a couple of times but nothing.Hopefully someone has a (simple) solution

:)