Low Stock Notification Not Working

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Hi,
I used VirtueMart 3.2.6 and Joomla 3.8.2 and the Low Stock Notification Not Working.
Have this function a Bug?

I need a notification to vendor whene the products quantity in stock - the booked quantity are <= Low Stock Notification...

TEST SITE: http://www.progressoweb.com/virtuemart/administrator/
USER: admin
PASSWORD: testsite

You can operate in beck-end without problem. Someone can help me?

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Please anyone can help me?