Last seen info unavaible

My end device keeps with the status last seen info unavaible.
It’s not a migration, i’m adding a new device, all the keys are correct, and i’m using an example code from lmic lib to send the message. The gateway is recieving the message, but the application layer never sees the device.

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If you need anything else plz tell me, i’m really new to this

There are many many forks and variants - most depricated or deficient wrt correct V3 operation - so which one exactly and from where?

Here is the link to the lib