MQTT not connecting to AWS IOT with MKR NB 15000

[mrks89]

I am using the Cloud Example from Arduino IDE and could establish a NB-IOT connection but now I am stuck on the mqtt connection. I read many thread but nobody seems to have the exact same issue. The sole response of "ERROR" does not lead me to anything.
I am connected to PC via USB and antenna attached.

Here is my debug log:

OK
AT+CEREG?

+CEREG: 0,1

OK
You're connected to the cellular network

Attempting to MQTT broker: xxxxxx.1.amazonaws.com
AT+USOCR=6

+USOCR: 0

OK
AT+USOCO=0,"xxxxxx.1.amazonaws.com",8883

ERROR

+UUSOCL: 0
AT+USOCL=0

ERROR
.AT+USOER

+USOER: 9

OK
AT+USOCR=6

+USOCR: 0

OK
AT+USOCO=0,"xxxxxx.1.amazonaws.com",8883

ERROR

This repeats infinite times.

[mrks89]

@per1234 what is missing?

[per1234]

@mrks89 this is a place to submit formal reports of defects or proposals for enhancements regarding the code hosted in the repository. Those reports and proposals may eventually be evaluated and resolved by the developers.

This is not a place to request assistance with your project. If you were hoping for that, you must post on the Arduino Forum:

https://forum.arduino.cc/

[sprucify]

Check if you get back an DNS server from your provider

AT+CGCONTRDP

Have you setup certificates right?