Thanks for the updated information! 1) Do I engage Lithium to help manage a batch upload? The only field missing is "username". Every registered user whether partial or complete has a Lithium ID. I am able to extract a list of al partial registrations in an excel or CSV file, I simply need to understand the process to do a batch upload and randomly assign user names. 2) Do all of the legacy partial registrations need to be 100% complete before we go on to the next steps? 3) Can you clarify what IDP stands for again? 4) It sounds like we will need to generate usernames on our end of the SSO token generation which would then be passed to Lithium going forward, otherwise we are looking at a customized solution, correct? Thanks! Dani