First attempt hardware:
https://www.amazon.com/dp/B08R6MPCKR
Second attempt hardware:
https://www.amazon.com/dp/B017ECWI2Y
https://www.amazon.com/dp/B08ZRYR6M3
https://www.amazon.com/dp/B097H7HB5J
Same results, audio from one mic appears equally on the other stereo channel.