Periodic downlink - encodeDownlink() - device joinrequest after ~14 Days

i think i have another problem.
Since yesterday, no device status downlink has happened on the affected devices.

There are no link metrics to see. With the test device on my table, these are there and the device status link also works.

I have already deactivated an affected device and entered the app key. but didn’t help.

Anyone an idea?
I created all devices with gRPC (api.DeviceService Create), but the test device by hand. The keys with api.DeviceService CreateKeys. but, as I have now seen, entered the application key of the device in nwk_key and app_key, was that possibly wrong?

Device without links metrics, no device status


test device