Why did my scene not transition?

Configuration
1

I just set up a couple of scenes and the only difference between them is the state of a GE direct connect smart bulb.

I thought I had it set up so that the light would dim over 5 minutes at 10pm, but I watched it this evening and it just turned off instead of dimming.

What do I need to do to make the transition gradual rather than instant?

Here’s my relevant yaml:
automation:

  - action: scene.turn_on
    metadata: {}
    data:
      transition: 300
    target:
      entity_id: scene.birdssleep

new scene

id: "1738807594858"
name: BirdsSleep
entities:
  light.cynclamp_01:
    state: "off"

previous scene:

id: "1738807274829"
name: BirdsBedtime
entities:
  light.cynclamp_01:
    state: "on"
2

Does the light support transitions? If it does not, it will not work. You may also try rather than transitioning to state off instead going to brightness 0.

3

I have a similar issue with scenes.

I have HUE lights and HUE scenes trough the HUE integration.
If I use HUE app then the transitions work, if I call the same scenes with an home assistant automation the transition dosn´t work and the switch is instant.