Passing a wwan to OPNsense running in KVM

[FarmServer]

I have a Sierra EM7565 LTE modem I use on a laptop for roaming around and for whatever reason I wanted to try passing it to a KVM of OPNsense.

I am using Virt-Manager to do this and I am passing just the USB device to OPNsense. Then when I log into OPNsense via the terminal(in the KVM window) I can see under /dev that there is a cuau0 device being added. The OPNsense webgui also sees the /dev/cuau0 device under PPP devices. Unfortunately I cant get OPNsense to communicate via AT commands to the modem.

I tried configuring the modem settings between MBIM(USBIF) and Legacy-Generic, as well as switching from qmi to mbim mode for the data link but none of the settings seem to communicate in OPNsense. For whatever reason the device does not seem to want to talk to OPNsense but will talk to Debian just fine.

The error I get in the webgui is "failure to issue AT command" and in terminal I can use

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cu -l /dev/cuau0 which gives me a CONNECTED status, but I cant enter anything after that.

I was thinking I might need to pass the whole USB bus, but there is only one bus and that would take all of my USB ports, touchscreen, etc. with it.

Does anyone have any experience doing this? I don't have any other modems to try so I cant be too sure it isn't a BSD issue with this particular modem.