Google IoT Core w/ NB IoT can't connect

Hi,

I am using the arduino tutorial for connecting MKR 1500 (NB-IoT) to Google IoT Core with the corresponding librairies.
It doesn't work.

Azure tutorial works fine, but not IoT Core.
I have done it several times while following each step precisely.

I have different hypothesis :
- certificate are no longer working and I don't know how to update them with the ones provided by Google (roots.pem)
- maybe the connection is not TLS 1.2

Is it still working for other MKR 1500 and Google IoT Core users ?

Start with the Arduino tutorial for connecting the MKR 1500 NB-IoT board to Google IoT Core and review the corresponding libraries. Check the provided roots.pem certificate and whether the connection uses TLS 1.2, comparing the result with the working Azure tutorial. Done means the board connects successfully to Google IoT Core or the failing compatibility issue is reproduced and documented.

Written by the indexing model from the issue text.