Toughbook says “Insert Sim” but working Sim is already inserted!

I might sound crazy over here, but this is pushing me to the brink. I have multiple Panasonic CF-20 Toughbooks, all with the same issue.
The sim is inserted correctly, sim is working correctly in other devices but the Toughbooks all say “Insert Sim”

I have tried firmware, drivers, downgrades, updates, windows updates, networking in command prompt, and some random sim program to try and fix it. I am at my wits end. Sim provider is Telstra – Aus. As you can assume, they have no issues on their end.

Send help.