Issue with Microphone

So im trying to use a microphone on the Blizzard Voice chat but the app doesnt detect it at all.
The Mac itself detects it and the mic clearly works.

Its an attachable microphone that goes with a headset (the app doesnt detect the headset either)

This is the headset in question:

Hey there,

Some newer versions of Mac OS will need to be configured to allow apps to use the microphone. They have an info page on this here.

Let me know if this works for you!