In the backoffice, it’s nice to be able to look for customers for UserID and email, but as the official documetnation says that the UserID shouldn’t be something easy to guess because security reasons, being able to look for customers by display name would be handy.
Right now, we have to look for the user name in our own database, find the email, and then look for the customer by email in your database. But you already have a displayName value for it. Make it searchable please.