Hi Stian and thanks for sharing!
This is very strange because the type of cable included in the package has been tested to work with the Arduino MKR NB 1500 for both power and data transfer.
I understand that you are unable to upload your code from the computer to the Arduino board, is this right?
On another note, we’ve had some issue while network attachment is happening regarding power delivered by (any) USB cable from a computer laptop. This can usually be resolved by attaching a LiPo battery to the Arduino.
Glad to hear that you managed to solve it by switching cables!