You can see attached. I have tried this in:
- InPrivate Window
- Incognito window
And yes, I am a unit admin.
Seems this person had the same issue, no resolution.
[Unable to edit scout’s leadership position - Scoutbook / Scoutbook Bugs - Scouting Forums]
(Unable to edit scout's leadership position)
The funny thing is I can add a leadership role for this scout in their troop, but not when I chose the Crew. Seems a bug?