Fix To No Access-Control-Allow-Origin Header is Present Or Working With Cross Origin Request In ASP.NET Web API - CodeProject
Access to XMLHttpRequest at from origin 'https://.sharepoint.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. – Shakir's Blog
Enable CORS In ASP.NET WebAPI 2
CORS for Content Delivery across Different Domains | Gcore
Javascript CORS - No 'Access-Control-Allow-Origin' header is present - Stack Overflow