Hi @lucas_a.tx
I was able to solve this issue by using qmicli instead of ModemManager to configure the modem connection. Maybe it is worth mentioning this alternative on the Modem Support Toradex site?
In case anyone has the same problem. here is a step-by-step guide on how to do that with qmicli: Techship - FAQ - How to step by step set up a data connection over QMI interface using qmicli and in-kernel driver qmi_wwan in Linux?
Best,
Thorbjörn