Our Modem works fine with Meraki version MX 14.53 Z1 / Z3
MX64 with firmware version 14.53 ( may take some longer time to recognize a modem)
To get it to work make sure the Meraki version is supported.
Run connection with modem first (https://www.connectedio.com/support#how-do-i-configure-the-modem)
When connecting to Meraki
For more information please refer to Meraki documentation:
https://documentation.meraki.com/MX/Cellular_with_USB_Modems