I've been trying all afternoon to invite about 35 new members to our ArcGIS Online for Organizations account using a .csv file. I feel like I've tried everything, but keep getting an error message stating "First name may not be blank. Last name may not be blank." All entries have a first and last name, as well as the rest of the required header fields (Email, First Name, Last Name, User, Role). I am at wits end, because I've done this process successfully many times before. I'm beginning to wonder if there's something going on on the backside that's NOT
