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Serial LTE Modem AT commands not working in AT client on nRF9160 DK

Hi,

For the testing purpose, I would like to send a few basic packets from LTE Link Monitor on nRF9160 DK to our cloud. I found a way how to do it through the nRF9160: Serial LTE Modem example.

However, when I try to execute AT commands from that example I get +CME ERROR: 0 and phone failure in the log. Is there anything else that should be configured when flashing the AT Client example on the DK?

Please see the log below so you are sure that I am connected to the network etc. 

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2020-03-08T18:17:59.664Z INFO Application data folder: C:\Users\Lukas\AppData\Roaming\nrfconnect\pc-nrfconnect-linkmonitor
2020-03-08T18:17:59.751Z DEBUG App pc-nrfconnect-linkmonitor v1.1.1 official
2020-03-08T18:17:59.751Z DEBUG App path: C:\Users\Lukas\.nrfconnect-apps\node_modules\pc-nrfconnect-linkmonitor
2020-03-08T18:17:59.751Z DEBUG nRFConnect 3.3.0 is supported by the app (^3.2.0)
2020-03-08T18:17:59.751Z DEBUG nRFConnect path: C:\Users\Lukas\AppData\Local\Programs\nrfconnect\resources\app.asar
2020-03-08T18:17:59.751Z DEBUG HomeDir: C:\Users\Lukas
2020-03-08T18:17:59.751Z DEBUG TmpDir: C:\Users\Lukas\AppData\Local\Temp
2020-03-08T18:17:59.754Z VERBOSE Could not fetch serial number for serial port at COM3
2020-03-08T18:18:07.657Z INFO Modem port is opened
2020-03-08T18:18:07.664Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-03-08T18:18:07.713Z DEBUG modem << +CFUN: 0\x0D\x0A
2020-03-08T18:18:07.716Z DEBUG modem << OK\x0D\x0A
2020-03-08T18:18:09.554Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-03-08T18:18:09.570Z DEBUG modem << +CFUN: 0\x0D\x0A
2020-03-08T18:18:09.579Z DEBUG modem << OK\x0D\x0A
2020-03-08T18:18:10.981Z DEBUG modem >> AT+CFUN=1\x0D\x0A
2020-03-08T18:18:11.024Z DEBUG modem << OK\x0D\x0A
2020-03-08T18:18:12.157Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-03-08T18:18:12.170Z DEBUG modem << +CFUN: 1\x0D\x0A
2020-03-08T18:18:12.177Z DEBUG modem << OK\x0D\x0A
2020-03-08T18:18:12.179Z DEBUG modem >> AT+CGSN=1\x0D\x0A
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