Northern Trail Outfitters (NTO) is troubleshooting why a triggered send isn't being delivered to the...

The Auto Suppression List in SFMC is used to automatically suppress subscribers who meet certain criteria, including those with a status of 'Held'. When a subscriber is marked as 'Held', it means that the system has detected delivery issues with that email address, such as a hard bounce. This can cause the subscriber key to appear twice in the _subscribers data view, once with the status 'Active' and once with 'Held'.

References:Salesforce Marketing Cloud Documentation on Auto Suppression Lists