Hi Razmik,
I was having the same issue and came across a couple of articles that did(found on reddit) and did not help, BUT I did get the microphone to work with Skype for business. See below for the steps I took
Step 1: Disable The System Integrity Check so that you can access the relevant system database.
Reboot your Mac and hold Cmd+R on startup. This will bring up the Recovery Mode.
Open Utility > Terminal from the menu bar and type csrutil disable
Reboot to normal mode.
Step 2:
Using the terminal, Open the database by giving command: sudo sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db
Provide your password when requested
Within sqlite3, For Skype for Business audio fix type in command:
INSERT or REPLACE INTO access VALUES('kTCCServiceMicrophone','com.microsoft.SkypeForBusiness',0,1,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109);
Type .exit to exit the sqlite3
Skype for Business should be visible in the Security & Privacy preferences Privacy-Microphone view now
Step 3: Clean up
Reboot your Mac and hold Cmd+R on startup. This will bring up the Recovery Mode.
Open Utility > Terminal from the menu bar and type csrutil enable
Reboot.
Hopefully, this help you as it did for me. :)
Thanks,
