Devices can't connect any more to TTN

Hello all,

I have 15 devices working in a application.
Now I removed al my devices en made new structure for my applications.
After I put al my devices back in TTN the devices does’nt work any more.
The are stuc on Last seen: Never.
Can anybody tell my what I’m doing wrong?

Regards
Reinier

If these were OTAA devices you’ll have to force them to re-register, perhaps by resetting or power cycling.

Mis-entering some of the details could be a cause too.

Do you have access to the raw traffic feed from a gateway near them?

The were registering in OTAA and ressetting does’nt help.
Also my 15 devices were correct inserted in TTN, no mis-entering.
I have my own gateway but the devices were not connected so notting is registering in my gateway.

Just watch the gateway log and see what happens if you power up a node.
Do you see an OTAA join request?
Does it have the correct device EUI and App EUI?
And if so, do you also see an OTAA join accept from the network?

I would double check the device EUI, App EUI and App EUI as registered in TTN and entered into the nodes.