Not able to connect nrf cloud using serial ltm application

Hello,

I have nrf9160 with AT&T sim card, I have used the serial LTM application.

device is registered in nrf cloud with UUID provision method.

I execute the command AT#XNRFCLOUD=1 which gives me response as XNRFCLOUD: 0,0.

below is the configuration used in prj.conf file 

CONFIG_SLM_NRF_CLOUD=y

using nrf connect sdk version 2.5.0 I am not able to communicate with nrf cloud.

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