Skype for business

This appears to be a known feature of 16.28.175. Microsoft recommends some twisted operations on the TCC.db :(

The better solution appears to be to download 16.28.120 from https://download.microsoft.com/download/D/0/5/D055DA17-C7B8-4257-89A1-78E7BBE3833F/SkypeForBusinessInstaller-16.28.0.120.pkg. Just install over the newer version. As soon as you make a phone call SfB will properly ask for the permissions to access the microphone and life is good again.

You're not the only one who has the problem that the microphone doesn't work with Skype for business.

There are topics at Microsoft Community Forum, please follow those topics:

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_sfb-mso_mac?

Maybe this will help: https://support.skype.com/en/faq/FA34713/faq-and-known-issues-with-skype

Skype requires access to Screen recording in the Mac System Preferences to share your screen during a call in Skype on macOS Catalina.

This link is for Skype, not Skype for Business.

Thank you. This fixed it.