blocked by CORS policy -No'Access control allow origin '

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Hi team

I fetch discount codes from lookup.JSON to check if it is valid or not on cart page,  I got this error when hit discount coupon code , in console "Access to fetch at '' (redirected from '') from origin '' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource" . But this code already working on my another testing store " ".  Can you help to solve this issue?


Thanks in advance