ERR_BLOCKED_BY_RESPONSE.NotSameOrigin 403 (Forbidden)

My main domain is using cloudflare DNS and the script running on the main domain allows users to add their own custom domains to the script, now all custom domains are now loading properly and the external resources as css javascript and so on are being blocked by this message
ERR_BLOCKED_BY_RESPONSE.NotSameOrigin 403 (Forbidden)
I believe that it has something to do with CORS ( Cross-Origin Resource Sharing) how can I allow these addon/custom domains to use the same resources as the main domain?

Cheers

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