Hi there,
Thank you for reaching out to the Auth0 Community!
We are trying to reply to older posts, in case others encounter the same error and find it useful; one possible reason of this behaviour would be if there are any whitespaces within the values or illegal characters, that are not allowed as, for example, email formats. A similar issue was brought up in this topic as well : Auth0 disallows emails with valid format
More information around User Import can be found in the following docs :
- https://auth0.com/docs/manage-users/user-migration/bulk-user-imports
- https://auth0.com/docs/customize/extensions/user-import-export-extension#export-users
Hope this helps!
Gerald