I am using a clean install of Drupal 8 with REST API enabled and the webform module install. I have created a basic webform with all the correct permissions and enabled /entity/webform_submission in the REST config section.

The form has a single field named full name with the key full_name. The webform ID is contact.

When I try to post data to the webform using postman I get a 500 error "field full_name is unknown". I know the key exits and the form is correct because if I change the name of the form to something that's doesn't exist I get a "Form is not a valid bundle type for denormalisation" error.

The json I'm sending is:

   "full_name":"My name"

Any ideas?

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