If your Windows 10 is updated to version 2004. There is a chance that your Japanese Keyboard setting might be messed up a little bit. I will show you the way to reset your Microsoft IME (Japanese Keyboard) to the previous version.

• Press Windows Icon
• Cick Setting (Gear Icon)
• In the search Box Type “IME” and choose “Japanese IME Setting”
• Click General
• Scroll down to the bottom of the page and Click On next to the “Use Previous version of IME”

And that’s it, you got your IME just working again just like before.