You must enable the Messages app in SQS before an operator can receive and acknowledge messages.
To enable the Messages app:
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Unlock Supervisor tools in the Fleet Apps page.
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In the Supervisor tools page, select Fleet Setup.
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Select the Core tab from the list of modules, then tap the Messages slider to enable messages.
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Restart the display.
The Messages app is enabled; the operator can now receive and acknowledge messages on the Home screen and in the Messages app, which is available in the Fleet apps menu.