Structure wont generate in custom biomes

I have a biome that generates in the world along with vanilla biomes, but I cant get my structure to spawn only in that biome. 
"biomes": "#is_overworld", - My structure spawns in my biome but also everywhere else
"biomes": [
    "minecraft:forest",
    "customforest:enchanted_forest",
    "minecraft:badlands"
  ], - My structure spawns in forest and badlands but not my biome
"biomes": "#customforest:has_structure/ef/well", +
{
  "replace": false,
  "values": [
    "customforest:enchanted_forest",
    "minecraft:badlands"
  ]
} - Spawns in badlands not my biome
Anything I am missing here I cannot figure this out