When user wants to add item to a queue, the default view used to perform the lookup is the “Business Queues” view.
Don’t try to look it up in customizations – it’s not there and seems to be hard-coded. Not only that, it’s not documented anywhere [I could find] making it extremely difficult to understand what is it, how to deal with it and how to explain it to the end users.
Not for the first time, SQL Server Profiler and troubleshooter’s hunch to the rescue.
Business queue is a queue that is assigned as default to neither users nor teams.
Here you have it. I understand why it’s not defined as a system view – it’s one of those – impossible to define in Advanced Find. If you have a queue that does not show in Business Queues view (typically after the upgrade from 2011), just find and remove link to it from the teams or users using it as a default. In other words, find users and teams that have field Default Queue linked to the queue in question and set it to null.