This has been asked many times, none of the answers work. Asking once more for this basic feature will at least amplify the spotlight on this long standing zapier issue..
How can I use Zapier to set a reference field (essentially a select field pulling its selects from another collection) in Zapier?
This relates to the helpful error message:
The app returned "ValidationError: Validation Failure".
- Sending the exact text of the reference field name does not work.
- Unfortunately, there is not much else that can be tried.