Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
A family asked to change dens for next year, so I moved their son to the desired den. The “Connections” on scoutbook did not automatically get updated. I changed this back in classic SB.
This should happen automatically if someone moves into a den
(NOTE: I wasn’t able to test whether or not the Den leader had access to the new scout in SB+. They would not have had in SB Classic regardless if needed for contact info)
To be fair, SB Classic was kind of buggy with this too. I would often have den leaders say they were unable to see new scouts added to their den, until someone who was tech savvy enough knew to go into the “Scout Connections” menu
There is no concept of connections in Scoutbook Plus. Den Leaders, Den Admins, Key 3 and Pack admins should all be able to edit advancement for all the Den’s Scouts in Scoutbook Plus.