
Could you please check the Office information for further analysis via going to on Office app, click File > Account > Product Information?
Then check the version name, version number and share with us.
The dictation feature is only available to Microsoft 365 subscribers. Dictate is not available in Office 2016 or 2019 for Windows without Microsoft 365.
If you are using Microsoft 365 apps, please also check the update channel like following image.
Besides, try to update it to the laste version.
Please also make sure you have Windows 10 or above.
Dictate needs connected experiences in Office, please go to Word, click File > Account > Manage Settings under Account Privacy, turn on the Optional Connected Experiences.
Any updates, you may post back.
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