Found Duplicate mac-address xxxx

[ClemonsLA]

I suspect my user's Mac Address is somewhere else on switch, no idea where though.

#shutdown

#no switchport port-security mac-address xxxx

#swtichport port-security mac-address xxxx

returns:

Found duplicate mac-address xxxx

Is there anyway to figure out where else this Mac is?

i've already searched through #show mac address-table | i xxxx and found the mac on the port it's supposed to be on. But yeah i cannot re-enable port security (i disabled port-security for the sake of the user for now) until i figure out how to clear this duplicate. 

[Mark Elsen]

 - One starting point could for instance be : https://macvendors.com/ , determining vendor can lead to additional hints as to who is causing this.

 M.

[ClemonsLA]

i think you misundstood the question. I edited question for clarity.

[Mark Elsen]

 - Lookup the mac address on the core switch(es) , check if anywhere else being used besides current local device.

 M.

[MHM Cisco World]

there are many place the mac is add 
check show running do you see static mac (PC mac) add to other port 
check show port-security mac-address table, check the mac is add to other port