[MT-AU Public] CRS109-8G-1S-2HnD-IN usb port not working with LTE

Hi Guys, I have a Huawei E8372 that works on a hAP just fine. But when I plug it into a CRS109-8G-1S-2HnD-IN it does not register as an LTE device even though both devices are running the same firmware. Nor does it work as a PPP device on either mikrotik. Has any one had luck getting the USB port to work on the CRS? Any help would be very happily received! Thanks Andrew