Consider the following scenario:
You enable the AlwaysOn Availability Groups feature in Microsoft SQL Server 2012.
You enable the Log Shipping feature on some databases that are in an AlwaysOn availability group.
You have a monitor server to monitor the log shipping.
In this scenario, the backup job is running correctly. However, you receive the following error message:
Error: 14420, Severity: 16, State: 1
The log shipping primary database %s.%s has backup threshold of %d minutes and has not performed a backup log operation for %d minutes. Check agent log and logshipping monitor information.
The issue occurs because the log_shipping_monitor_primary table is not updated when the sys.fn_hadr_backup_is_preferred_replica system stored function returns "0".
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.