Make sure your appliance (air conditioner, TV, etc.) is already added to your Hub Plus/Mini and Google Home is ready.
For your ref:
→ Step 2: Link "SwitchBot Smart Home" service on Google Home App
Search "SwitchBot" and add "SwitchBot Smart Home" service.
*Notice: Use the same SwitchBot account to link. You can see your account in the SwitchBot App's left menu bar.
* Please ask your Google Home to update the device list after adding a new device.
* You can say:
"OK Google, sync my devices."
Update: appliances learned by "Others" can support Google Home and Alexa services by using IFTTT.