Input for make.com connection

Hi guys, so im making a contact form flow that's linked to make.com using webhooks to then automatically send an email to my clients. So far my flow captures the name & email with no problems using Entities. The problem i'm having is capturing the message that a person would send. i have an entity called {contact_form_messages} however whenver i type in a message it comes up with the 'no match' error message. I have the data type listed as 'custom' but it still dosent work. I've tried adding multiple different values in etc but i still cant get it to work. any help would be much appreciated thank you in advance