No, there are no unknown devices in device manager. Thinking this was a Windows 11 issue, I have tried this on a Windows 10 machine with similar results.
This forum discussion appears to have the same version of the EM12G that I have.
I can see two different HID/PID devices:
USB\VID_2C7C&PID_0307&MI_00
USB\VID_2C7C&PID_0307&MI_02
I am unable to see any way to send AT commands. The forum post I linked previously suggested there should be another ID:
USB\VID_2C7C&PID_0307&MI_04
None of the Quectel driver packages I have tried have installed have been compatible with this PID. The only set of drivers that I have been able to get to work are the ones extracted from the Microsoft Surface Pro 7+ update package.
There is also a possibility that the M.2 USB adapter I am using is limiting by ability to access the device fully, but I do not have another one to try at the moment.
The card does not appear to have any COM ports available, and I have only been able to get a COM port by putting the device into QLoader mode by shorting the pins (as detailed in the previously linked forum post).