unknown or unspecified error
The identifier is not a valid secret agent identifier.
No secret agent returned secrets for this request
The caller tried to unregister an agent that was not registered.
The caller does not have permission to register a secret agent, or is trying to register the same secret agent twice.
The user canceled the secrets request.
Errors returned from the secret-agent manager.
These errors may be returned from operations that could cause secrets to be requested (such as nm_client_activate_connection()), and correspond to D-Bus errors in the "org.freedesktop.NetworkManager.AgentManager" namespace.