I've just opened a ticket for the same issue. I've tried hundreds of fixes. I doubt there's a fix anyone can suggest that I haven't tried.
Ultimately my windows mic volume indicator always stays low no matter how much I boost. I've tread all windows settings (mic and privacy), boosts in OBS (which works but the sound is sooooo distorted and noisey its pointless, like i have to use a 10dB+ boost), driver update etc, everything. On top of this my friends can hear my desktop audio even when I mute my mic so there's an internal audio leak somewhere.
I've never seen a fix by Corsair and I believe its a faulty design they don't want to admit otherwise imagine the recall cost!