why I'm unable to record multi-track audio

I only get output of audio in windows media player and openshot for only the main source audio track, not for the aux/mic.

I have set advanced mode in the output. I'm using CBR at 6000KB with NVIDIA NVENC H.264.
I have selected stream audio to be track 1, and recording tracks to be 2 and 3 checked (not recording stream audio).
I have selected main source to be on track 2 (and 1) checked and aux/mic to be on track 3 (and 1) checked.

I followed these instructions: https://obsproject.com/kb/advanced-recording-guide-and-multi-track-audio
OBS 30.1.2 and all the latest drivers etc. simple mode single track all sounds in one streaming and recording works just fine.

What's going on and is there an issue for the advanced mode audio recording into tracks. video recording works fine.
 
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