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.
@CraigStachewicz neither really - you can see these links for more information -
A major focus of the migration to Scoutbook Plus is to have positions mirror the positions shown in My.Scouting to ensure positions were reflected accurately in both platforms. The main purpose it to honor the guidance of our charter organizations and the positions they approve. Therefore, Scoutbook Plus does not use Legacy Scoutbook positions. Registered positions are used to provide base permissions. Some additional permissions can be added by the unit, however, there are restrictions on what can be given. See the updated Scoutbook_Permissions.pdf and the Scoutbook Plus permissions video for more details. Just as permissions are now limited - so is report access - https://filestore.scouting.org/filestore/scoutbook/Report-Permission-Access.pdf
The question was what is the scouter’s current registration, not which one do you want it to be.
If they show as registered in both positions in the same unit, your council registrar will have to end the “wrong” one in the system from their end. It’s not fixable by the unit or anyone here.
If they are registered as one or the other, the COR or COR Delegate can change to another registered position in my.scouting. Alternatively, the Key 3 or Key 3 Delegates can make the change in SB+. Sometimes, there are issues when switching registrations (e.g. being stuck simultaneously registered in both positions), in which case the council registrar may need to get involved to fix it.
This user is currently registered as an Assistant Den Leader, which does not come with any default permissions. If the pack wants to give him more permissions, they need to use the Permissions Manager.