If a device is already claimed on another project, you must release it there before you can onboard it to a different project. To remove a device, open the nRF Cloud portal, go to Fleet > Devices, open the device page, and choose one of the following options:
- Delete Device removes the device from the fleet and releases the claim, so another project can onboard it.
- Deactivate removes the device from the fleet but keeps the claim, which blocks other projects. You can reactivate the device later.
Both actions permanently remove the device's fleet data, which is the historical messages and the configuration. You must onboard a deleted device again to reconnect it.
For more information, see Deleting, unclaiming, and deactivating devices in the nRF Cloud documentation.