NotSubnetOwner

Sign with the key or origin that owns the target object, then retry

The signing coldkey is not the recorded owner of the subnet it tried to administer (e.g. setting subnet identity or owner-only hyperparameters). Compare the caller against the SubnetOwner storage entry for that netuid.

Declared by the SubtensorModule pallet; it classifies to the semantic code not_authorized.

Remediation

Sign with the key or origin that owns the target object, then retry

The same explanation is available in the terminal: btcli explain NotSubnetOwner.