Hi @EnggCollege , has the 450 ever registered out to the cloud?  The MX can’t register using cellular fresh out the box.     Secondly, is your dongle in the supported list:   https://documentation.meraki.com/MX/Cellular/3G%2F%2F4G_Cellular_Failover_with_USB_Modems#Supported_USB_Modems ... View more