bose headphones connection issue with macbook pro

Dear all,

I have searched this forum for advice pertaining to my particular issue: my bose headphones are connecting with my MacBook Pro as usual but of late they actually don't work. I can't hear anything. So, there is connection but no sound. I've checked all the boxes, the preferences, I have shut down my lap top and restarted, I have deleted the app from my phone and restarted etc. I have connected my headphones to the MacBook Pro as suggested. Nothing.

My head phones are connecting via bluetooth but no sound.

thanks.