Hello,
Two things:
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please read this How to share code or flow json and edit your code above accordingly so that other people can import it.
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secondly the right way is
var yourvar = env.get("yourvar");
. But as the environment variables in subflows are quite recent additions and the func-exec node you use hasn’t been updated in 1 1/2 years it could be that it doesn’t support it. Is there a reason you don’t use a combination of a normal function node and an exec node instead?
Johannes