# CannotUseSystemAccount (/docs/errors/chain/CannotUseSystemAccount)

The hotkey supplied for registration, hotkey swap, or subnet-owner-hotkey assignment is a reserved subnet system account. Use a regular user-generated hotkey instead; system accounts are derived per-subnet and rejected by `is_subnet_account_id`.

Declared by the `SubtensorModule` pallet; it classifies to the semantic code [`not_authorized`](/docs/errors/not-authorized).

## Remediation [#remediation]

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

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