Hi, We’ve created a web application and add it in auth0 as a regular web application. Users can connect with a “Username-Password-Authentication”. Next we’ve created an API “proxy” to manage auth0 users. We’ve added this API in auth0 as a “machine-to-machine” API. Of course this API is not using …

This error is expected if you are creating users this way. The /dbconnection/signup endpoint should allow you to do what you are trying to do here.

API to create user with connection of another App

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