You know, I saw this the other day when you posted. I was about to try and figure out how to confirm the missing records, but got slightly overwhelmed and left it.
-come back to:
-and that's absolutely brilliant. It worked, and now I was also able to rebuild users like it kept asking me for...
Here's a quick recap:
Wanted to migrate from a Joomla (CMS) Kunena forum to XF.
No importers exist, so I opted for migrating to WordPress's BBPress forum software, and then on to XF from there.
Used this BBpress importer (https://xenforo.com/community/resources/bbpress-importer.5474/) to...
How does this actually work? Where do I run it -- directly in the db as a sql command?
If that's how, I take it, it only works if both BBpress and XF are both on the same server?
Sorry for the noob questions.
EDIT: OK figured it out. Word to the wise, take note of Chris below.