Need help with web request with basic authentication

Hi,

I am trying to make a web request that requires basic authentication, but if fails with -1001 error in the CIQ simulator.

My URL is https with a valid certificate from Let's Encrypt.

My code looks like this:

function makeRequest() as Void {
    var options = {
        :method => Communications.HTTP_REQUEST_METHOD_GET,
        :responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON,
        :headers => { "Authorization" => "Basic my-base64-encoded-user:pass" }
    };
    Communications.makeWebRequest( "https://mydomain.com", null, options, method(:onReceive) );
}

The request works in Postman, but I cannot get it to work from the Garmin CIQ simulator.

What am I doing wrong here?