UserAction user list

I am testing a process flow with 6 new users.  I am able log into the portal with their accounts and view their inbaskets.

I am adding them to a UserAction by username instead of task.  I have verified that I am able to add my user account.  When I add the properly spelled, uppercase/lowercase username of one of the 6 new users, I get an error in flow administration saying that they are not valid flow users.  "Error in first queue call.  No valid users or tasks with valid users were assigned."

Also, when you search on users in the UserAction, they do not show up in the user list.

I'm sure it's some sort of setting or something.  Does anyone have any idea?

Thanks.

Joe Haveman

StewartTitle