Error: "The My Tableau Prep repository is either read only or can't be found" Launching Tableau Prep Builder on Mac

Issue

When launching Tableau Prep on macOS Catalina 10.15, the following error occurrs:

Error Running Tableau Prep Builder. The My Tableau Prep repository is either read only or can't be found. Check that the repository location is in a directory with write permissions or contact your System Administrator

Environment

Tableau Prep Builder 2019.2.2 and newer versions
macOS Catalina 10.15

Resolution

As a workaround, manually grant permissions to the My Tableau Prep repository folder by taking the following steps:

Go to System Preferences > Security & Privacy
Click the Privacy tab
Scroll down the list on the left and click Full Disk Access
Click the lock on the lower right to make changes
Click the "+" symbol below the list of applications
In the file dialog that opens, browse the Applications folder and select Tableau Prep Builder
Click the lock again to prevent further changes

Once finished, you should be able to close all open dialog windows and run Tableau Prep Builder successfully.

Cause

This behavior is related to a known issue with ID 952365 which is currently under investigation.
New permissions requirements for applications were introduced in macOS Catalina 10.15.