Hi
Thank you for your question in this community, according to your description of the problem,
I know that you have put in a lot of effort into this issue, and I am sorry for the inconvenience caused to you, let me try to help you solve this problem:
The sound of this voice in Word may be related to the sound settings on your computer.
The standard three voices (David, Zira, Mark) is the default US. As shown in the screenshot, other regions have different voices.
Did you lose these voices? If so, you can try the following methods to add voice to your computer to try to solve this problem:
If it is not correct, have you ever added a third-party plug-in on Word to get these sounds?
And, can you provide your version information and your subscription information to help us better test this issue, because the settings of different versions may be different:
You can provide a complete screenshot through file>accont to help us analyze, pay attention to hiding personal information!
Once again, sorry for the inconvenience, your understanding and support are greatly appreciated!
Best Regards
Ethan