In case you missed the announcement: The Alteryx One Fall Release is here! Learn more about the new features and capabilities
here
ACT NOW: The Alteryx team will be retiring support for Community account recovery and Community email-change requests after December 31, 2025. Set up your security questions now so you can recover your account anytime, just log out and back in to get started.
Learn more here
Here's my solution to challenge 25. In my solution I've actually filtered out the nulls apart from users who have only visited one merchant. I think it's a more accurate portrayal of the brief than the actual desired output.