I need some things too, but I won't put it in all caps. I assume you are trying to play Rec Room and your microphone is not working. What device are you playing on?
If it is an iPhone, sometimes uninstall/install the game again, run it and it will ask for permissions you use your microphone. Accept it and you should be able to use the microphone in game.
What do you mean by "REC PASSCODE"?