I always get this error when trying to fetch from my website

Access to fetch at 'https://inventory.zoho.com/api/v1/items' from origin 'https://myredirecturi.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

I tried self client and server based same error.