Summary

To start using the Write-Back with Tableau Server it is necessary to grant permission for the extension to run when dragged to a dashboard. Source: Tableau Documentation

Granting permission in Tableau Server

Step 1: Access Tableau Server Settings

Login on Tableau Server with an administrator role account.

Go to Settings > Extensions

Step 2: Enable Write-Back

Under Enable Specific Extensions, add the Write-Back URL.

The URL can be obtained by opening the trex file on a text editor. Look for the excerpt as below, which has the URL inside the <url> tags:

 <source-location>
      <url>https://myserver/twbe/site/default</url>
 </source-location>

Select Allow on Full Data Access.

Choose to Show or Hide the User Prompts. (This prompt shows up when the extension is opened the first time on a dashboard)