CancelBondingProcess -> Not authorized

Want to cancel a running bonding process by sending CancelBondingProcess.
But as a reply I get Not authorized, unfortunately.
What might be the problem (However, I'm root)?

In case I can send this message how can i detect a correct cancellation of
the BondingProcess?
In dbus-api.txt I've read something about the Signal AthenticationCanceled
but from which Interface gets this send?

thanks

-- 
Regards,
--Codefritz

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