Can't join RDF as party

When trying to RDF with a friend we get "One or more party members do not meet the requirements for the chosen dungeons."

Level 40 and 49. We're both able to join RDF solo.

We've both tried the /script LeaveParty() that's recommended in similar threads, but still broken after. Have tried converting to raid and the same script, as well as relogging.

It probably means you can't be matched in the same dungeon due to level difference.

Is there a minimum number of dungeons we have to overlap on in order to random queue? We had 3 that we were able to specific queue into together.