MatchSrf will still not allow a join

In the attached, I have three surfaces that appear to be next to each other (the middle one was created as a sweep using the edges of the others). However, they will not join. I can’t seem to find any combination of matchsrf setting that will allow them to join. Any ideas on how to proceed?
Problem MatchSrf.3dm.zip (60.4 KB)

Hello- RebuildEdges on the two outer ones allows a Join.
RH-70921 Join fails

-Pascal

Thx, I will add that to the toolbox.