Answer to "Nintendo Switch not charging, USB-C port, BQ24193 or M92T36 chip?"I'm sorry, I read your post again and I noticed it doesn't work when docked. My idea was to see whether it was outputting to HDMI, which would require proper power negotiation with the dock, function apparently handled by the M92T36 chip. Since this isn't working, I would say this chip is probably at fault, which also does not mean your BQ24193, which is the actual battery charging IC, is functioning properly either. If I were you, I'd first order an M92T36 replacement and give it a try.
Answer to "Nintendo Switch not charging, USB-C port, BQ24193 or M92T36 chip?"What happens when you leave it running off the AC adapter/Dock? Does it deplete your battery? Is the system showing any decrease in battery levels when running in any modes?