Portal usernames must be unique system-wide, over all ftwilliam.com customers. If you receive the message that the username already exists and the user is not present in your list of existing users, this indicates another customer within ftwilliam.com is already using that username. You will need to alter the username or make it more unique in order to add him/her to the system as a user. We suggest trying one of the following options to make a username more unique: JDoe123, JohnD123, DoeJohn, DoeJohn123, etc.