I’m having the same issue. Windows shows “No Service” and the check of the EM7455 shows it as “No signal” and no roaming. I’ve been trying to enable roaming but they don’t make it easy. I was able to get it to ask me to connect once but after it failed the option never came back even after power off restarts.
C:>netsh mbn sh int
There is 1 interface on the system:
Name : Cellular
Description : Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A
GUID : {---E-44-F-45-------}
Physical Address : b4:--:--:--:--:--
State : Not connected
Device type : This is a remote device
Cellular class : GSM
Device Id : 0145....
Manufacturer : Sierra Wireless, Incorporated
Model : Sierra Wireless EM7455 Qualcomm
Firmware Version : SWI9X30C_02.20.03.22
Provider Name :
Roaming : Not roaming
Signal : 0%
RSSI / RSCP : 0 (-113 dBm)