cant find device using MAC address on access switch

[Mohd Khairul Nizam]

hardware : C9200L

as attached, i cant find the mac address of the device using pipe expression

but for the AP i can find it , only the IP phone cant 

[Leo Laohoo]

MAC addresses are expressed in lower caps.

[Mohd Khairul Nizam]

no luck also. 

[Leo Laohoo]

What is the output to the command "sh mac add add 7802.b179.4c68"?

[Mohd Khairul Nizam]

i hve key in several mac address

[Leo Laohoo]

Ok, that means that the MAC address you are searching for isn't "talking".