ID request change

I found out today one of my business clients has had an unauthorized teamviewer access from an unknown source. I went in and changed all the access passwords in the company today. The issue was with only one computer and I wonder if there is a way to permanently change the ID for that computer?

Also, I have the access ID for the unauthorized access visitor. Is there any way to find out where it was coming from or even what city and town possibly?

Thank you in advance!

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