well, you can give it a try.
I have a similar problem. Dragino Dragino LGT92 v1.5 deleted. Now I wanted to insert it again and get the error message Conflict. Cache was cleared, but still the same error
wait for an hour and try again
After I was able to register four identical devices, I also received the message “Conflict” on the fifth device. Unfortunately, this message is not very specific and helpful. It is a manufacturer’s devEUI, the device is fully functional under TTN and has never been registered by me in Cayenne.
Please let me know how this conflict can be resolved.
can you private message me the DevEUI.