Using Sendgrid API with WordPress

I’m trying to use the Sendgrid API on WordPress, but getting this error
when inspecting.

XMLHttpRequest cannot load Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin' header has a value '' that is not equal to the supplied origin. Origin 'https://localhost2' is therefore not allowed access.

First I though was a service that requires HTTPS, so I setup https on my local MAMP server but still not working, then I tried multiple strategies, namely changing htaccess file, adding CORS header in the file but nothing really worked.

$'',mail,{ headers: {
            'Authorization': 'Bearer MY IDENTICATION',
            'Content-Type': 'application/json'
        console.log('Error' + data);
        console.log('Error' + data);

This is the angular function I used to post to the API.

Can anyone help me to explain what exactly the error means( or am I missing anything)

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