Hi,
BBB starts recording as soon as you press the "start recording" button.
If you have done this with 1, 2, 50 or 100 participants in a room, that means the feature is working and is not a bug. Have you actually done this?
Where did you hear that at least 2 participants are needed?
"If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."
Regards,
J.