How to scan LTE-M networks and connect to them

Hello, guys.

I just wondered why use LTE Link monitor from nRF Connect make nRF9160 scan lte-m networks and even connects to it.

And when I'm trying to use external MCU to control it - it is not able to connect to network.

I send the same commands that I see in logger of LTE Link monitor.

Even I add some commands that I read in documentation about AT commands.

I use serial LTE modem firware.

Please help, because I don't know what the problem is.

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