Network Security Settings on a CE500 Switch using CNA

I have been trying to change the network security settings on a CE500
Switch from Low to Medium and therefore enabling 'MAC address
authentication on all Catalyst Express 500 switches in the community'.
However when i go to enter a MAC Address i get an ERROR: Incorrect MAC
address format
I've try xx:xx:xx:xx:xx:xx
and xxxxxxxxxxxx
but with no joy
Can anyone help?
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