Hi @tommy soo
Welcome to our forum!
For better research, please provide more details about this case:
Do other users in the organization have the same problem?
Does reading aloud work in other Office apps?
There are many reasons for this problem, try the following possible solutions:
Repair the Office application, and when you're done, you may need to restart your computer.
Check that you have the language pack, voice pack, and handwriting pack (all 3 options) installed in your preferred language. This thread provides detailed steps to add them, you can refer to:
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