api-version is not being sent correctly

Dear friends I have a weird issue I try to connect to an API and when I try to do the API requests in postman or insomnia everything is okay but when I use the same code on my website or even localhost the leads request doesn't work and tells me that api-version is not defined.

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var settings = {
        "async": true,
        "crossDomain": true,
        "url": "https://affiliate-api.tradingcrm.com:4477/token",
        "method": "POST",
        "data": "{ userName: \"alpt\", password: \"Alpt@12345\" }"
}

$.ajax(settings).done(function (response) {
        var settings2 = {
          "async": true,
          "crossDomain": true,
          "url": "https://affiliate-api.tradingcrm.com:4477/accounts/lead",
          "method": "POST",
          "headers": {
            "Authorization": "Bearer " + response.Token,
            "Api-Version": "3",
            "Content-Type": "application/json"
          },
          "data": "{firstName:\"test\",lastName:\"test2\",email:\"test@test.test\"}"
        }
        
        $.ajax(settings2).done(function (response2) {
          console.log(response2.accountId);
        });
        
});
</script>

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