diff --git a/tb_pulumi/__init__.py b/tb_pulumi/__init__.py
index d0e9af5..76a2d37 100644
--- a/tb_pulumi/__init__.py
+++ b/tb_pulumi/__init__.py
@@ -254,7 +254,7 @@ def flatten(item: dict | list | ThunderbirdComponentResource | pulumi.Output | p
         # pulumi.info(f'FOUND TCR: {item._name} -> {item.resources.values()}')
         to_flatten = item.resources.values()
     elif isinstance(item, pulumi.Output):
-        to_flatten = item.apply(lambda i: i)
+        to_flatten = item.apply(lambda i: flatten(i))
     elif isinstance(item, pulumi.Resource):
         # pulumi.info(f'FOUND RESOURCE: {item._name}, {str(item.__class__)}')
         return [item]