How to access the popup text via primary port

Technical Questions Robot Communication
1

According to the primary port interface document, we can read the text in popup windows (e.g., raised by popup function in ur script) via the primary port.

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However, after trying to communicate with the primary port on our UR5E robot (polyscope version 5.11.0), we cannot find a message package with robotMessageType = ROBOT_MESSAGE_TYPE_POPUP even if there is a popup window on the polyscope software.

Could anyone tell me under what condition the robot will send us a POPUP message? How can I read the popup text via the primary port (or any other interface)?

Thanks!