OK, I got it to start after realizing that the bit about copying tokens and such was setting up in vsc, rather than joplin.
I now find that while I can create a new note in vsc, and some number of edits will be reflected in joplin, if I then go and edit that same note in joplin, vsc never sees the update, unless I exit and restart.
Is this expected???
(If I open a note with joplin's external edit button syncs seem to work fine.)