When we: Sign in to backoffice in umbraco 13 Then navigate to the contact us page on the front end Submit the form We get a 403 and cannot navigate to any page on the site until we clear our browser cookie for this site.

We upgraded the same site to version 15 and did not see that issue. But version 15 is not completely ready with the features we want so we had to revert back.

Anyone have any idea how to resolve this in version 13?