Your posts will not become visible until they are viewed by a forum elf. Don’t double-post.
We have a section of the forum for multi-channel work. Not all systems work in Audacity. It’s not unusual for makers to have their products mount as collections of stereo devices so when they’re connected cold with no other effort they do something. Multi-Channel is a special service.
Then, when you install special driver or interface software, the full multi-channel process is revealed.
In some cases, it’s never revealed. Some devices require ASIO software which Audacity does not support.
https://forum.audacityteam.org/t/multi-channel-recording-in-audacity/15644/1
Koz