I access Clarity using SQL Management Studio, and usually build my queries there. In Tableau you can connect to MS SQL, and there's a Custom Query box where you can paste your query and it essentially builds your data source. I'm not familiar with the third party tool you are referencing.
In our case clarity is a sql server so I can connect directly to it although it's not the most efficient way to get the data due to resource availability. So, if there are a lot of queries/reports running at a particular time or date such as the first of the month or first thing in each morning , your visualization's performance would be impacted if you used a live data link.
But given that Clarity is a lagging database that generally has data no newer than prior ETL which is usually nightly an extract would work great. That is what I do and am very happy with the results.
I'm currently working on a project to integrate EPIC and Tableau. Currently we're accessing Caboodle with Tableau's native MS SQL data connector but are just getting started. Active directory to controls access and before anyone is added they have to be approved.
In researching this topic I found the following thread helpful.
See the comment by Mark Jackson.
I'll try to comment as we navigate issues in the future.
Hope this helps!
Agree with all that has been said. Sounds like you need to get access to the SQL server that Clarity is hosted on. Are you using Tableau Server? If so, you should talk to your admins to make sure Tableau has access to this server as well. They may also have dealt with this in the past.