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Nordic Thingy91 "cloud_connect failed: -111"

Dear DevZone team, 

I am using Thingy91 in NB-IoT mode because I am located in Germany. Last week I managed to connect it to the nRF Cloud by updating the firmware (thingy91_nbiot_legacy_pco_v0.2.2.bin) using MCUboot guide (https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/thingy91_2d00_fw_2d00_update_2d00_mcuboot). It was working well and I could also see GPS data. 

However, after some time LED turned red and eventually battery died. After charging it back I again tried to connect to the cloud but could not succeed. I updated the firmware once again with MCUboot but got no result. Device tries to connect (the LED blinks 3 times blue, and then once green) but I receive "cloud_connect failed: -111" error.

I have searched through the similar issues here on the DevZone. Somebody wrote there might be a problem with certificates. If so, can I install those certificates using MCUboot? 

I have attached log file from the Link Monitor below.  The command "AT%CMNG=1" gives "OK" as a response.

Thank you in advance for help. 

Best regards, 

Murad Lachynov

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