Have you downloaded the required language pack (Chinese)?
Click Add a language
to search for the language pack on the opened page and click Next
to download it.
Then you can see the input method and click to switch it. When you choose the Chinese input method, you can switch between simplified and traditional Chinese through the set hotkey.
If the response is helpful, please click "Accept Answer" and upvote it.
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[5]: https://learn.microsoft.com/en-us/answers/articles/67444/email-notifications.html