Device does not exist

Hello everyone,
I have configured my device with the correct dev EUI but my object still does not exist.

level=error msg=“uplink: processing uplink frame error” ctx_id=fb03d866-1549-4b55-8baf-aeb774941b79 error=“get device-session error: object does not exist”

and also using the API

Any ideas please? I deleted and re-created my device but nothing good happended…

A not found on GET …/activation likely means that the device is not yet activated.