You can check the identification code of the device you are using by following the steps below.
▼Get the identification code (Mobile App)
https://teachme.jp/8/manuals/9920280
If an administrator wants to view registered identification codes, please refer to the following.
▼Manually register, edit, or delete identification codes (Web browser version)
https://teachme.jp/8/manuals/9124481/
Related: What is an identification code?
https://help.teachme.jp/hc/en-us/articles/900006443243