Hi, Takeshi Halley
The problem may not be with Sound Recorder itself. Windows can hide a disabled recording device, or the audio control software may identify the headset jack incorrectly.
Besides the solutions provided by the Q&A Assist, here are some suggestions you can try:
Press Windows + R, enter mmsys.cpl, and press Enter. Open the Recording tab, right-click an empty area, and enable Show Disabled Devices and Show Disconnected Devices. If the headset microphone appears, right-click it, select Enable, then Set as Default Device.
Search Start for Realtek Audio Console, Waves MaxxAudio, or your PC maker’s audio app. Reconnect the headset and, if a connection prompt appears, choose Headset rather than Headphones. Selecting Headphones can leave the microphone portion undetected.
Press Windows + R, enter services.msc, and restart Windows Audio and Windows Audio Endpoint Builder.
Test the microphone in another app. If it works there, open Settings > Apps > Installed apps > Sound Recorder > Advanced options, select Repair, and use Reset only if Repair does not help.
Thank you for your patience in reading, I hope this information has been helpful to you.
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