Are you having trouble with Google Voice Match or Personal Results?
If your assistant is responding something along the lines of, “You need to turn on Personal Results,” go into your Google Home app and choose the speaker/home hub you are setting up with your Smart Faucet, go to settings, and turn on Personal Results.
To turn off voice match on your Google Assistant for the device linked to your Moen account, go into your Google Home app, click on the linked device, go to settings, and turn off Voice Match.