Issue
When activating LBLM on Tableau Desktop or Tableau Prep using Tableau Server on-premise, the following error can occur intermittently when the Application Server ("Vizportal") process is not located on the initial node, or is located on multiple nodes:
'Unable to activate by signing in. The Tableau license server at https://atr.licensing.tableau.com/443 returned an error. If the issue persists contact Tableau Support.'