It very clearly says it’s not a CORS policy issue. It says the request “does not have a HTTP ok status”. That’s not a policy issue, that just means your API endpoint is returning an error.
Please have a look in the Network tab in your browser to see that the request is being made and is actually responding successfully. If not, please fix and then test again.
And please make sure to always carefully read error messages. Just because you’re doing a CORS request does not mean that the issue can be solved by updating the CORS policy.