SIM Card is not recognized on reServer i31115(16G+512SSD/W)

Hi, unfortunately multiple working SIM cards are not recognized by the edge server. After long research, the 5G modem used is finally recognized and can be accessed using AT commands, but it says that a SIM card is missing. No SIM card is recognized in the console either.
A truenasscale is running on the server, which in turn is running a vm with openmptcprouter. Both recognize the modem but not the SIM card. When you plug in and unplug the card, nothing happens, neither in the kernel nor in the syslogs.
Has anyone had a similar problem? Thanks in advance!

root@OpenMPTCProuter:~# mmcli -m 0
  -----------------------------
  General  |              path: /org/freedesktop/ModemManager1/Modem/0
           |         device id: 9500b2a77c12e95656b9006c72f84871aaf6f8e4
  -----------------------------
  Hardware |      manufacturer: +CSCS: ("IRA", "GSM", "HEX", "PCCP437", "8859-1", "UCS2", "UCS2_0X81")
           |
           |                    Fibocom Wireless Inc.
           |             model: FM350-GL
           | firmware revision: 81600.0000.00.19.15.13
           |         supported: gsm-umts, lte
           |           current: gsm-umts, lte
           |      equipment id: xxxxxxxxxxxxxx
  -----------------------------
  System   |            device: /sys/devices/pci0000:00/0000:00:06.0/usb4/4-1
           |           physdev: /sys/devices/pci0000:00/0000:00:06.0/usb4/4-1
           |           drivers: rndis_host, generic
           |            plugin: generic
           |      primary port: ttyUSB4
           |             ports: eth2 (net), ttyUSB4 (at)
  -----------------------------
  Status   |             state: failed
           |     failed reason: sim-missing
  -----------------------------
  Modes    |         supported: allowed: 2g, 3g, 4g; preferred: none
           |           current: allowed: 2g, 3g, 4g; preferred: none
  -----------------------------