We have made necessary changes in Adobe Cross Origin Sharing Configuration policy in configMgr.
Also we have added "Access-Control-Allow-Origin" in headers file under dispatcher.any but we are still facing this below issue. when we try to hit the java script of salesforce component from aem.
Access to XMLHttpRequest at 'https://xxxxxxxx.com/c/createClassLightningOut.app?aura.format=JSON&aura.formatAdapter=LIGHTNING_OUT' from origin 'xxAEM DEV AUTHORxxx.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
This issue was solved through daycare ticket. The issue was at salesforce side and some white-listing was needed to done at their end.
Hi You have to make CORS changes in salesforce server in order to use their script in your application.
I would recommend checking if the dispatcher is caching the "Access-Control-Allow-Origin" header. Might be an invalid header cached.
Also, you can setup a DEBUG logger on "com.adobe.granite.cors" to check for more details about the failure.
More troubleshooting steps at