Automatically prompt someone to sign in or create an account
It would be a GREAT upgrade to the software, if instead of the software rejecting a sign in when someone has not yet created an account (as happens currently) that it instead gave them a message that they must have an account and sign in before they register. The screen should simply give two options - sign in or create and account. This would save a ton of confusion and multiple phone calls from customers.
Walt Bilofsky commented
I don't know if this helps, but we have customized our Authorization Required system page to include an invitation to membership and a link to a page with information for prospective members.