I have a scene that I made using the deprecated Groups and Scenes app for when I go to bed. I linked it to Google Home. I created a goodnight routine in the Google assistant. All it does is turn on the virtual device associated with the scene. So I can just say "okay Google, in going to bed." This has worked perfect ever since I set it up a year ago or more.
I wanted to do the same thing but make a kids goodnight routine. I created a new RL instance and set it up how I wanted. Down at the bottom, I entered a name for an activator device. Shared it with Google Home. When I create a routine in the Google Home app, select to control a device, and try to select the RL activator device, nothing happens. I can select any other device and it asks me to set the device (like on, off, brightness, color, etc).