I have the same problem and none of the suggestions to fix it did not work.
I found something that worked. Download an extension to Microsoft Edge. In Microsoft Edge click:
...>extensions>Get Extensions
Then search for "read aloud." Download the one that looks like a bullhorn. Add the Extension to you ribbon.
The "read aloud" voice uses Mac's default voice. But the Microsoft voice options are located at the bottom of the list-- or you can download your own.
Hope this helps.