Even if you enabled the Stereo Mix a few days ago, it is worth checking whether the Stereo Mix is enabled in the options. The problem you might be having is that the Stereo Mix might not be enabled.

Method 1: Enable and Set Stereo Mix as Default The bottom line is, this isn’t a huge issue and it’s usually caused by bad settings or driver problems. On the other hand, if you aren’t hearing any audio at all then that means there is an issue with the drivers or your cable connectivity since your computer isn’t outputting the audio. If you are hearing the audio (meaning Stereo Mix is actually picking up the audio) but you aren’t getting any audio in the recording then the issue might be with the application or the settings. The reason behind the Stereo Mix not working depends on what you are experiencing. you might have used the Stereo Mix successfully a day before the problem started. The issue might appear out of nowhere e.g. In other cases, you might not see the Stereo Mix bar moving at all. In some cases, you might see the Stereo Mix bar moving while recording but the recording won’t have any audio. For some users, the Stereo Mix might not work even after enabling all the options. But, you might face a problem while using the Stereo Mix. This can be very useful in desktop recording sessions. Stereo Mix is an option that enables the user to record the sound that your computer is outputting.

Discord stereo mix not working