When I add a user to a group and they try to login, I need to reset their password (or they need to click on the forgot password link.

For instance, I added a user to Moderators within a particular channel. I have the user logout and log back in, but when they do, they get the message, "You have entered an invalid username, email address, or password ..."

This has happened before, when I created a Test Topic channel and added a couple of us. The users that I added reported the same issue.

What setting do I need to change?

Thank you.