Configured Filters are not processed and scripts added to external tasks are not running.

External tasks should be created as mentioned below:
https://docs.citrix.com/en-us/workspace-environment-management/current-release/user-interface-description/actions/external-tasks.html

However in order to process the external tasks we need to check the option "Process External Tasks" under Advanced settings.

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Problem Cause

"Process External Tasks" option in Advanced settings was not checked