Errors "Unable to connect" or "Malformed response" Connecting to Published Datasource with OAuth Authentication

Issue

When connecting to a published datasource which has been configured to prompt the user for credentials via OAuth, one of the following errors might occur:

An error occurred while communicating with Tableau Server

Or

Error: Unable to connect to this Tableau server data source.

Or

Malformed Response from Tableau Data Server

Environment

Tableau Desktop 2018.2.8, 2018.2.9, 2018.3.5, 2018.3.6, 2019.1.2 and 2019.1.3
Published datasource using OAuth authentication*

Resolution

Option 1

Upgrade to Tableau Desktop 2019.2 or a newer version. See Tableau Desktop Downloads and Release Notes for downloads of current and previous versions of Tableau Desktop. For more information on current releases, see Upgrade Tableau Desktop and Desktop Upgrade.

Option 2

As a workaround, use an earlier maintenance release in the same version family - such as 2018.2.7, 2018.3.4, or 2019.1.1. These versions can be downloaded from Tableau's Product Downloads page.