Modify users with REST driver

I am trying to understand how to use the REST driver functionalities. Have a case where I want to update current users in IDM with data from an API ednpoint. To do that I setup the Publish channel to recieve data from the API. 

I can recive the data from the API but the problem is that I´m not able to update users. This is more like a test for me to understand how to work with the driver. I tried to customize the contract from API as much as possible (so that I can use most of the standard behaviors of the driver) so it´s just hardcoded data which tries to update a telephonenumber. 

The problem I run in to is this:

This is the input:

This is the JSON data the gets recived from the API:

 

Any ideas how to push me in the right direction here?

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