WordPress LMS Theme for Academy and Education Institutes › Forums › App Support › App Development fail : blocked by CORS policy: No 'Access-Control-Allow-Origin' › Reply To: App Development fail : blocked by CORS policy: No 'Access-Control-Allow-Origin'
The CORS are most likely returned in response. If you’re using caching plugin w3tc then make sure it is not adding any .htaccess code to remove cors.
On many sites using w3tc we found this issue.
I will need admin credentials to further debug this.