Unable to send "Add a Member" emails?

We’re a newly chartered TL troop, all rights went to COR, “Manage Troop Members” was added to myself. I was not able to send the emails.
We’ve gotten past it by adding all privileges to myself but, what is the ‘correct’ and ‘minimum’ Access and combination of Privileges to be able to send the emails?
Next troop would probably love to know…