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I have a headset mic with stereo connector into a Rode VXLR adapter going into my mixer. But the mixer is not picking up anything. The mic works fine on my PC.
I guess the Rhode does not do stereo to mono conversion (spec page is very bare http://www.rode.com/accessories/vxlr) but this page says it does https://www.gear4music.com/PA-DJ-and-Lighting/Rode-VXLR-Stereo-35mm-Mini-Jack-to-Mono-XLR-Converter-Box-Opened/1WF9?
The principal problem is not mono/stereo but that headset microphones are electret condenser microphones requiring plugin power. You need the VXLR+ adapter rather than the VXLR adapter for that, and even then it will only work if your mixer provides phantom power (usually +48V, there may be a switch for that).
A headset microphone is not likely a stereo microphone. But it could be a combination TRRS plug combining mono microphone and stereo headphone signals in which case you'll need another (cheap passive) adapter for splitting the microphone signal off.
