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 (iOS)
▼Locate your device ID (iOS version)
https://teachme.jp/8/manuals/9920280
Mobile App (Android)
▼Locate your device ID (Android version)
https://teachme.jp/8/manuals/9920300
Windows Desktop App
▼Locate your device ID (Windows Desktop Application)
https://teachme.jp/8/manuals/9920320