Run Pro GP Tool step in Pro returns “Tool has failed to open”

Description

After correctly configuring a Run Pro GP Tool step within ArcGIS Workflow Manager, when starting the step in ArcGIS Pro, the following error is returned:

"Tool has failed to open"

Cause

If the name of the geoprocessing tool in the Tool Name text box matches the name of an Arcade expression, the step fails, see: Add and configure Run Pro GP Tool

Note: 
If a parameter value obtained from an ArcGIS Arcade expression is incompatible with the tool, the step fails.

Solution or Workaround

1. Workflow Manager Administrators can envelop the tool name (within the step configuration) in single quotes, for example, 'buffer'. This ensures that the tool name is not treated as Arcade.
2. Alternatively, starting at ArcGIS Enterprise 11.1, the Workflow Manager Administrator can use these steps:
   1. Open the configuration file: %ProgramData%\esri\workflowmanager\WorkflowManager.conf in a text editor.
   2. Uncomment the following lines (while keeping existing formatting).
      • wmx.steps.proGP {allowedList = []}
   3. Enter any additional GP Tool names that match an Arcade name (clip, buffer, etc.).
   4. Restart the Workflow Manager Service service(s).
   5. Run the steps again in ArcGIS Pro.

Note: 
The second solution is for new tools or tools that have names matching new Arcade functions over time. Existing Pro Tools (as of ArcGIS Pro 3.1) with matching Arcade names (clip, buffer, etc.) will work without quotes.