I am having what appears to be the same problem as was reported in this thread.
I attempted to log into the Scouting app (under Android 9.x) with my my.Scouting credentials, and got the error message:
“Your Scoutbook Account needs to be Connected to a Scout as a Parent/Guardian to use the Scouting App”
I verified that I still appear to be connected to my son as a parent in Scoutbook. I went into my positions via the My Dashboard -> My Units -> Troop Roster -> My Name, and Updated all of my positions (last one in the line was Troop Admin). Then, went to my connection to my son via My Dashboard -> My Family and Updated my connection to him there. The app still throws the same error.
Any other thoughts on what to try before I submit a bug report?