It is about re-creating an existing User Pool that has a custom domain name mapped. The same situation applies when deleting a custom domain of a User Pool and re-assigning it.
At Horizon State, we wanted to utilise Amazon Cognito for a while. But not having native support for passwordless authentication held us back for a while. Recently, we had some time to dig deep into it.
Overall it was a good experience, but this post is about one head-scratcher I faced while setting up custom domains.