This issue is typically caused by the absence type linked to the absence being set to inactive in lookup administration. If you have the required permissions, follow the steps below to resolve this.
Log in to CallConfirmLive!.
Click System, then click Lookup Administration.
Expand the Absence Type folder.
Locate the absence type linked to the absence and double-click it to open the details.
Ensure a tick is shown next to Active. If the absence type is not active, make it active, add the end date to the absence, then set it back to inactive.