I can create 2013 workflows just fine on any other site in SPD. When I try to create a workflow from a list in my newly created site collection I receive the error.
The option for the SharePoint 2013 Workflow platform is not available because the workflow service is not configured on the server. Please contact your server administrator.
Is the workflow service required to be registered on every site collection? I'm not sure how to enable these. Workflow manager is installed on the same server as SharePoint.