MicMute | Mute default mic clicking tray icon or shortcut | Menu library

This is my first question so I hope that I'm following the guide lines.

A friend of mine streams and is having problems with his discord mute Button. He mutes himself to not disturb the people in the call so he can answer a question in his chat, but than he forgets to unmute and doesn't talk for a few minutes. So I thought that I could give him a surprise and make it that when he mutes himself, an image appears on his display, that tells him that he is muted. But when doing that the the discord mute button doesn't activate, so I need ahk to activate the discord mute button and make the image appear. The image is done. But the muting part is really hard to do. It just won't mute him. If it's possible I don't want to change the initial hot key of control+b, which is his setting. Below is the Code. Thank you very much.