Found the issue for those who are also seeing this error.
From reading other “closed” threads where Auth0 took ownership of the issue, I figured it must have something to do with older user accounts. So I figured that editing the user in the web admin would fix the record… and it does.
So go to Users and find the affected user and select them. I clicked to edit email and then simply hit save (didn’t change anything). I also clicked edit on Name and did the same thing (not sure if that was needed).
The error stops on any user I do this to.