Mobs from Spawner not Spawn.

Chicken chunks doesn't have any spawners.. Nor does the ChunkLoader spawn entities. What are you refering to exactly?

If you are referring to vanilla spawners not spawning mobs when chunk loaded, the player needs to be near the spawner for it to spawn mobs.

Yes that's what I meant

Figured, Vanilla mechanic, the player must be within range of the spawner for it to spawn mobs. Nothing i can do sorry.