Okay Dirk, i have got a very Nice AVD with all needed flow actions for you:
Now, as you can see there is a function in it that you need to place in the App Settings of DC.
With your current DC version, you do not see that within the Web/Homey app. So copy it from the link above or update to the current Test version.
- Create the function (copy from link above) in App Settings.
- Create a new AVD and select the Control 2 dimmable lights as one template.
- When you get to the flow creation, change the Light 1 and Light 2 with the lights you want to control:
- Click update text and run it in the WebAPI Playground (just click on the link).
Tada, there you go!