Our team is working with Google to ensure that the issue with the Moto 360 is resolved.
Although we are working hard to make sure you can use the Google Assistant feature on your watch as soon as possible, we cannot provide a timeline for the fix.
Sometimes, changing the language options on your phone and watch to English(US) fixes the problem. We recommend this version because, in some cases, the other versions of English do not work.
Usually, changing your phone's language option will automatically adjust the language on your watch. To change the language settings, follow the instructions stated in this link: