I believe you need it in your configuration (yes, configuration.yaml) for the scenes component to get loaded. If it’s not loaded then the service will not exist. You just need the one line, nothing under it.
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Glad to hear the new scene feature, snapshot_entities, suited your application.
I’m late to the party but, yeah, you need to at least have scene: in the config file if you plan to use scene services (like scene.create).
That’s my understanding of it as well. Given that scenes have undergone significant enhancements recently, including the concept of snapshot_entities, perhaps it was overlooked to store them (to survive a restart). Or maybe it was a design shortcut to avoid having to create a means to manage these ‘on the fly’ scenes. 