D'CENT biometric hardware wallet requires a bridge service to be installed on your computer to function properly together with web applications like XRP Toolkit. The D'CENT bridge service only supports Windows and macOS. If you're on iOS, Android, Ubuntu, Fedora or similar, you cannot install and use the bridge service.
The same applies if you're using another browser than Google Chrome. D'CENT bridge service requires advanced web features currently only available in Google Chrome. This means you can only connect your D'CENT hardware wallet to XRP Toolkit from Google Chrome on either Windows or macOS.