I got a new simcard from otelo, it uses Vodafone network, but it couldn’t make the first connection.
I had to ask AI for some solutions and it told me to force IPv4 then switch back to dual version of IPv4 and IPv6. It then worked.
It told me that some devices can fail the first handshake and need to provide the device IMEI to the network in order for it to be registered.
While the issue is resolved already, this might be something to fix in the next firmware release.