I am probably missing an obvious one here but here goes,
A unit has about 16 scouts who have emails in system who do not show up on email messaging page. It does not seem to be an opt out issue.
Two scouts with emails in scoutbook but not available for messaging
133187861
133187890
Another scout in unit who appears as expected
136021549
No obvious connection between missing scouts. They are all on roster. All K3 are seeing the same thing
Ron