I have a team that all have privileges configured in Exchange to give them read/write access to the Inbox, and send-as privileges, for a shared mailbox. This works great on Outlook, where they can log in with their credentials and just pick "Open these additional mailboxes" in Outlook's account settings.
There doesn't seem to be anything precisely parallel to this in the iPhone, and the Googling I've done suggests that the easy way won't work on the iPhone.
But where things get really odd is that I don't seem to be able to add another Exchange mailbox on the iPhone with the shared mailbox's username and password. Every time I try to authenticate, I get a password error, despite validating the server settings and the password repeatedly.
How can I get this team the ability to receive, move/delete, and respond to emails for this shared Exchange account from their iPhones?