What is the difference between 'error="get device-session error: object does not exist"' and 'error="get device-session error: invalid MIC"'?

All I know is that they are all related to the secret keys related to network access.

Can anyone explain their wrong differences in detail?

No idea :-). I just know that first error is discussed here and second error is discussed here. Did that help?

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After searching the LoRaWAN Specification, I think the first error is more serious because devaddr has been wrong and it is no longer necessary to calculate the mic.

The second error occurs when devaddr is correct but the mic value is calculated incorrectly.

I don’t know if I’m right.