My friend had it as an option but I didn’t. Is it only in certain countries or am I a veg? There is a desert behind her. It changed scenery often. (Yes, I have a wake up Mohawk and she has her PJs on her head.)
It looks like FaceBook is implementing the virtual background feature they have in Zoom, as well as chat rooms. I don’t use Messenger so I can’t tell you why the option is not available for you – maybe it’s an App thing, and not available in browsers yet?