Good day @kc991,
Thank you for posting to the PayPal community.
This should be an issue with the "notify_url" parameter which is passing the old IPN URL in your website payment request API call to PayPal system.
Though you have updated the NEW_IPN_URL in your PayPal account settings, the OLD_IPN_URL might have been passed from your website as "notify_url".
The OLD_IPN_URL passed in "notify_url" will over ridding the NEW_IPN_URL marked in your PayPal account settings.
I request to please contact your website developer or the support of the third party platform eCommerce to cross check your website payment API request call and make sure your passing New_IPN_URL as "notify_url".
Once this is done, PayPal system will send the IPN response to your New_IPN_URL.
(Or)
You can avoid/stop pass the "notify_url" parameter in website payment API request call, since you have already updated the New_IPN_URL in your PayPal account settings.
Please refer the guide link : https://developer.paypal.com/api/nvp-soap/ipn/IPNSetup/#link-dynamicallysettingthenotificationurl
Thank you so much for your patience and understanding.
Sincerely,
Chiranjeevi
PayPal/Braintree MTS
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