RenderForm/This Sub-Zap by Zapier step hit an error Did you fork or replay this step? We expected callbackUrl to be stored!

Hi ​@TheChad 

Help links for using Sub-Zaps: https://zapier.com/apps/sub-zap-by-zapier/integrations#help

That error means your “Return from a Sub-Zap” step is trying to send data back to a parent Zap that no longer has an active “callback” link to receive it.

In plain English:

• When you trigger a Sub-Zap, Zapier gives it a callback URL—basically a one-time link for sending the response back.

• If you replay, test, or fork the Sub-Zap separately (instead of running it from the parent Zap), Zapier doesn’t generate that callback link.

• So when the Sub-Zap hits the “Return from a Sub-Zap” step, it’s like, “I don’t know where to send this response.”

Fix:
Run the Sub-Zap only from its parent Zap (not by itself or via test replay).
If you need to test the Sub-Zap independently, remove or skip the “Return from a Sub-Zap” step during testing.

Hi there ​@TheChad 👋 How did you get on with the fix Troy suggested - did it do the trick?

Let us know how you get on, want to make sure this gets sorted!