Error: Absence Created event model has an empty data hub identifier.

This error means that the absence in Access People Planner has generated with a blank DatahubAbsenceID (00000-00000-000000-00000).
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SelectHR rejects this absence due to validation which prevents the Absence Identifier coming through as empty, as this would cause data issues in SelectHR.
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The absence will need to be deleted in Access People Planner, then recreated to resubmit the absence to SelectHR.