Microsoft Windows and Apple macOS dictation is at present only available in select countries and languages.
You can read more about dictation and get updated supported language lists below:
If you experience any issues with dictation on Windows with an unsupported language such as your typing is garbled or incorrect, reboot your computer as this should resolve the issue. Alternatively, if your Logitech keyboard has an emoji key, try pressing it, as this could also resolve the issue. If it doesn't, please reboot your computer.
You can also stop the “Microsoft Text Input Application” in Microsoft Activity Manager.