Hi @preptogether,
Nice method! Thanks for sharing!
Don’t think that I’m hijacking your tutorial but just adding that you don’t need a button with list and you can have only the button and make the Update action conditional with All Users > Count and filter it! Check this post, posted by Bobby for better understanding! : Unique Usernames AND Emails - #7 by Bobby
Also you can watch this video made by Victor for this not duplicate feature : Adalo Hints: how to prevent from creating duplicate records in the collection - YouTube
Hope this helps!
Thank you