I'm trying to expose a lightning component with lightning out in a Heroku app. In localhost, I can able to view a lightning component developed in salesforce with lightning out.

But when I try to deploy this app into a Heroku platform this is not working.

It is throwing an error as No 'Access-Control-Allow-Origin' header is present on the requested resource. in the brwoser console

I have whitelisted the localhost and the heroku domain in the CORS and in the CSP Trusted sites.

What should I be missing?

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