AC microphone does not work

[Paulvonmalottky]

Hopefully, you can help me here!
currently, I'm using bose Bluetooth headphones in combination with the IMac from 2015. The headphones can not be the problem, because they work in other meetings like zoom and in addition to that, they work while I use AC on the Ipad. AC recognizes my headphones but rather I do the audio Test (everything is set fine) or speak to other people, there is no output. Nobody can hear me. 
I'm looking forward to fix this problem /:

[Paulvonmalottky]

luckily, I could manage it. In this case I needed to turn on the microphone rights in the privacy settings. Maybe this might help other people with the same problem.