'You cannot change "options.enabledDatabaseCustomization" error when attempting to import users via ImportMode

Problem Statement

We have an Auth0 database that contains some users. We also have an external database.
When trying to automatically migrate users stored in the external database to the Auth0 database, we received the below error:

Error! This database contains users. You cannot change "options.enabledDatabaseCustomization" setting.

Solution

As of the current design, we can not use Automatic Migration to migrate users from an external database into a username-password-authentication database. Instead, please follow the normal user export procedures to consolidate the various user stores before importing them back into a username-password-authentication database.