MIC Mismatch when adding device to app

Started migrating my devices over to TTN Stack V3 and hit an issue with my first device! Admittedly this is a new device so not had it running on V2 before.

In my Application I can see a JOIN REQUEST coming in and then being sent back out, promptly followed by a MIC Mismatch error and the JOIN REQUEST is then dropped.

I have double checked all DEVICE & JOIN EUI’s but still getting the same error, can anyone point me in the right direction?

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Probably you have a mismatch in the EUI, the App Key, or the LoRaWAN version.

You can try decoding the raw uplink by some other means to prove it.

All sorted now, thanks. Browan had issued an incorrect App key, new key issued and join went through OK.