Catalina - Apps that have requested access to your microphone will appear here I try to grant access for google chrome or safari to my microphone and both redirect me to security &amp; privacy section.
There are no plus or minus signs and no apparent way to allow these apps to use my microphone.
I also tried with skype but same story all over again unfortunately.
It seems to me that it is like a deadlock because no system call is activated apparently to enable the plus minus signs. Any ideas?

EDIT:
None of the solutions proposed here worked. I ended up reinstalling MacOS by using Option-Command-R at startup to upgrade to the latest macOS that is compatible with my Mac.
Now everything works. It should have been a problem of the OS installed on my computer.
This solution will likely help you to get what you are looking for it. 


Go to your user name under /Macintosh HD/ Users/XXXX 
Right-click on your username and click on Get Info 
Under the section “Sharing &amp; Permissions”, unlock the lock from the lower right and enter the password. 
Apply to enclosed items -> Click OK for the pop-up windows (Applying Permissions) 





Reboot your device and try again. It should pop up after that.