MIC Mismatch when adding device to app

TTN Network and Services The Things Stack v3
1

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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2

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.

3

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

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