I am trying to create a receipt and have the return address show up as a "co-owner", not my primary address. When I do this the email shows a return address of FormsCentral instead of the coowner. If I use my primary address, it works as expected. Any ideas? Both address exist in the pull-down selection.
Likely the email address of the other account is not verified. You need to open the form file using the other account and verify the email address.