Access to XMLHttpRequest has been blocked by CORS policy

I submitted a ticket but haven’t received a response (Ticket ID: 2780113). I deployed the new WAF managed rules and activated rocket loader, not sure if it is related but I’ve never received the following error message before:

Access to XMLHttpRequest at 'https://api.rlcdn.com/api/identity/envelope?pid=106' from origin 'https://ultracontest.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Can you please advise how to fix it?

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