Hi, is your bulb belong to xiaomi product? With the latest policy of Mijia, they don’t allow 3-rd partner control devices with brand Mijia. So you can’t see these devices from google home/Alexa/IFTTT. If you want to control these devices that disappear from google home/Alexa/IFTTT, please try with mihome skill. Google Home/Alexa/IFTTT won't support Mijia of Yeelight