Hiya,
maybe the below helps:
The animation seemed not to play for me either whilst using Blender 4.0.2 – The issue was that by default the node was set to only be using 1x frame i.e. only displaying the 1st frame of the animation. Changing this to a higher value to let all frames play solved it for me (+ changing the Emission Strength to > 0, as mentioned by Martin above).
Cheers & thanks CGCookie.com for the great tutorial 🥰
