Hello,
There might be some incompatibility issue between your SIM card and your equipment, so, is it possible that you can try with a SIM card from another provider to verify if you have connectivity?
Also, the latest firmware for RUT950 is RUT9_R_00.07.01.4 which you can download on the link here and upgrade the firmware from a file with the steps outlined here.
After the firmware update, could you please report your results when configuring the APN manually?
Best regards.