OK, thanks. I ended up making a new project, started over, and the problem went away.
Then I can comment my own thread… And as Daniel let me know, there is much missing in the XML export : tempi, mf, mp, sfz, fz, etc, ornaments, pedals… so I’m still wasting sooo much time. I cannot tell you how much I’m looking forward to the real thing 
Whatever you do, Dorico, don’t give up. I don’t want to go back!
We’re getting close ! I could send xmls to verovio humdrum and it worked! Thanks team !!!