the agent canceled the request because it was requested to do so by NetworkManager
some internal error in the agent caused the request to fail
the connection for which secrets were requested could not be found
the agent cannot find any secrets for this connection
the caller (ie, NetworkManager) is not authorized to make this request
the request was canceled by the user
#NMSecretAgentError values are passed by secret agents back to NetworkManager when they encounter problems retrieving secrets on behalf of NM.