Following the link https://developers.facebook.com/docs/workplace/integrations/custom-integrations/reference/post/#examples

I try to send a post to my page via API, but markdown doesn't format it. The text is unformatted. How do you make it work?

See my example below where I try and it doesn't work: (what's missing?)

https://graph.facebook.com/v19.0/pageID/feed?published=true&message=This+is+a+formatted+post&formatting=MARKDOWN&access_token=myToken