First of all, have these SIM Cards an active data plan? Did you tested in other devices? Seems your configuration is right.
For troubleshooting... Can you please restore the device to default settings?
System --> Administration --> Restore button.
Once you restore the device, if the modem won't work, can you please download the troubleshoot file and send to me in a DM?
System --> Administration --> Troubleshoot --> Download troubleshoot file button.
Any update please let me know.