After setup, Google Home discovers your favorite Flows. They don’t appear in the device list, but you can activate them by voice. Google Home syncs your Flows during the initial setup and when you sync devices manually
About naming your Flows
If you are experiencing issues starting Flows, ensure you pick Flow names that Google Assistant or Home can understand via voice commands.
Step 1
Open the Homey app and tap Flow in the tab bar.
Step 2
Long-press the Flows you want to use through Google Home, then tap Favorite.
Step 3
Head over to the Google Home app and sync your devices by pulling down until a refresh icon appears, or say, “Hey Google, sync my devices.”
Step 4
Google Home will synchronize the new favorite Flows. Now, you can invoke your Flow by saying, “Hey Google, start Flow name.”