Unable to Authenticate Using Anaplan Self-Signed Certificates

Issue

Starting from December 2019, you may notice that you can no longer use the Anaplan Self-Signed Certificates authentication method to connect to an Anaplan data source in any Tableau product.

Environment

Tableau Desktop (all versions)
Tableau Server (all versions)
Tableau Online (all versions)

Resolution

Switch to the username and password authentication. See below for steps on how to identify which data sources and data connections need to be changed as well as steps on how to change the authentication method.

Step 1: Identify which data sources and data connections need to be changed

In Tableau Server or Tableau Online, click Explore in the navigation pane on the left
Select All Data Sources in the drop down menu
Change to Show As: Connections
(if needed) Change to View as list using the View As drop down directly next to the filter icon. This view will display a list of owners
Click the filter icon on the far right
Under the Data Source drop down filter, select All data sources
Under the Connection Type drop down filter, select Anaplan
In the resulting list, look under the Username heading and take note of all data sources that have values of "signInType":"certificate"

Step 2: Change the authentication method for each affected data source
For published data sources

Connect to the published data source in Tableau Desktop
Right click the published data source and select Create Local Copy. Save the file anywhere on your machine
Right click the published data source > Close
Right click the local copy > Rename > remove (local copy)
Right click the data source > Edit Data Source...
Click the drop down carat for the data source under Connections in the upper left and select Edit Connection...
Change the authentication method to username and password and enter the appropriate credentials
Navigate to a worksheet and right click the data source > Publish to Server...
Overwrite the existing data source on server

For embedded data connections

Open the workbook in Tableau Desktop with the embedded data connection to Anaplan
Right click the data source > Edit Data Source...
Click the drop down carat for the data source under Connections in the upper left and select Edit Connection...
Change the authentication method to username and password and enter the appropriate credentials
Republish the workbook