The error message says a username 'Atacama$" is being used. Usernames ending in "$" are the computer account where Tableau Server is running, which means you do not have a Run As User set up for Tableau Server.
Either your SQL Server admin needs to update SQL Server to allow this account to connect, or you'll need to add a Run As user to Tableau Server that has permission to the database.
I assume you have local authentication. You may want to download the dashboard and ask DBA to create SQL Account and embed those credentials when you publish the dashboard onto the server or when you connect to datamart.