#Well... I kinda solved it. By setting

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blazing peak
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in the function node "create service call" set tag based on the entity id passed in. Before the subflow set msg.entityId to the light entity id. Then set const tag = lightreminder.${msg.entityId}; in teh function node. Change "belongs here?" to check if msg.payload.event.tag starts with "lightreminder". Then in "build message" remove the prefix "lightreminder." from the event tag. Which now is just entity id of light. Pass that out of the subflow instead of latestMessage