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You should be able to do this by setting up a table in your base with all of the users information, email, etc. Sync your data & then go to the “manage users” menu in stacker, and look for the option to connect a table as your user list. Everyone on that table should now be able to use that associated email address to register for your app. Just send them your app URL & let them self serve.

Exactly, thanks @sticky-hospital-72417!