FindUserPrompt take a string input, not a prompt. You would need to quote the value. However since you already have a prompt, there's no reason to use the find function.
https://help.mypurecloud.com/articles/architect-expression-help/

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Melissa Bailey
Software Engineer
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Original Message:
Sent: 11-21-2025 16:58
From: Jean Lam
Subject: How can I fix this error "FindUserPrompt' at position 15?
I'm editing a Send Response action box in a Inbound Message flow and copied the action box from another flow that works. I mainly changed the prompt name to a new one and now getting the error 'FindUserPrompt' at position 15 : There is no implementation that accepts a parameter of type Prompt.
I double checked the name of the new prompt and it's good. Tried another prompt name that has been working on other flows and still getting the same error.

#ArchitectandDesign
#System/PlatformAdministration
#Unsure/Other
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Jean Lam
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