There were some platform changes in the Spring '16 release that resulted in additional Field Level Security validations. These changes impact Case access for the Guest User profile, specifically for the Web-to-Case form associated with the standard Contact Support button in Experience Cloud Sites.
Organizations may find that submissions by these guests are not resulting in Case records.
Field-level security for the 'Web' fields needs to be updated for the Guest User profile for unauthenticated users to submit Cases from within the Experience Cloud Sites.
Once this has been done, Cases should be created without issue.
000386878

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.