Please refer to the following on how to locate device ID each app type.
Web Browser
You cannot locate device ID.
*Device restriction functions are available for mobile apps and Windows desktop apps.
Mobile App
▼Locate your device ID (Mobile app)
https://teachme.jp/8/manuals/9920280
Windows Desktop App
▼Locate your device ID (Windows Desktop Application)
https://teachme.jp/8/manuals/9920320