Wordpress user migration

I’m using passwordless login (email) on my Wordpress site using Auth0 WP plugin. I have an existing user in WP that I’m testing which I want to migrate to Auth0. After I enter the email for that user, I receive the email with the magic link but I then get an error: There was a problem with your log in There is a user with the same email. I’ve followed this tutorial: Configure Automatic Migration from Your Database. Can anyone help? Thanks