A family of Microsoft word processing software products for creating web, email, and print documents.
Hi, this is a widely reported problem at the moment where the option to upload an audio file for transcription is not working in the installed version of Word, this process is still working in the online version of Word in a web browser, there is nothing wrong with your Windows version or Office installation, this is a problem that Microsoft needs to fix on their side.
The best option is to open Word, then go to Help - Feedback - Report a Concern and report this bug to the Office developers there.