Mic Not Working

I can not explain the AMOUNT of troubleshooting I have done for this. I am a PC gamer, and I enjoy earbuds over headsets. I went to the store and bought a pair of Bluetooth earbuds that came with a mic. My computer has Bluetooth, and the earbuds connect without issue. The audio works...

I attached my headset to the control box and the control box to the splitter (laptop only has 1 3.5mm jack) and plugged it in. I went into recording devices and enabled the microphone (it was called stereo mix) but it's not picking up any sound. Help plz :(