No SIM card detected at initialization

at the configuration step of the peplink (either BR2 RPO, MAX BR1 Pro 5G or MAX BR1 Mini 5G) there is no SIM card found while it works fine.
This could be solved by switching the SIM card from slot, but this is not possible in my case. This issue only arises at the first configuration of the peplinks. Rebooting the peplink or resetting the modems does not work.

What is the root cause of this issue and could this be solved by itself instead of constantly switching SIM cards or up/downgrading?