Configuring ZMA Webhook for Zoho Flow : Missing Key Information Error

Configuring ZMA Webhook for Zoho Flow : Missing Key Information Error

I'm looking to send a webhook to Zoho Flow at the end of a Marketing Automation journey in order to perform more actions that I can't do with just a journey.

I have the Webhook created in Flow and set up in ZMA, however when I test it I get the error :
Skipped due to 'Key information missing




I've tried to select all contact fields as well as just the one :



The options at the bottom seem to be optional but I can't work out what the 'Key Information' is when all other steps of the workflow complete successfully