To change Teamviewer ClientID on Mac OS, you can use the python script TeamViewer-id-changer.py from GitHub. Follow these steps

1. Download script from Git Hub; or see download attachment below
   
2. Close TeamViewer (make sure the process has completely disappeared);
   
3. Navigate to your download folder
   
4. Rename the downloaded folder : TeamviewerReset
   
5. Open a terminal window
   
6. Change directory to TeamviewerReset.py
7. Run the script: sudo ./TeamViewer-id-changer.py;
   
8. Reboot the device.
   
9. Enjoy