MS Remote Desktop and Microphone

Hello,

I was hoping someone could help. I am attempting to use my microphone (AirPods Pro) whilst remote working. The software I have to use is Microsoft Remote Desktop. Currently, I hear sound via MSRD just fine.

I have looked in the System Settings but the software is not available for me to tick in the Microphone section and I have never been asked by the software to allow access.

Thank you in advance.