Trouble extracting Contact Form input to javascript function

I've been at this for hours, searching for answers, reading other people's issues and I haven't been able to fix this.

The setup: I'm hosting a website on AWS (S3 Static page), and I'd like a user to submit their input via a Contact Form. Inline javascript will intercept that input and send it to an SNS topic, which then emails me the information.

The issue: I get "null", [object HTMLInputElement], or just blank values when I try to retrieve Name, Email, and Message inputs.

What I've tried:

• document.querySelector('#Name');
• document.getElementById('Email').value;
• document.getElementById('Email');

Any help would be greatly appreciated! Cognito and SNS are working perfectly, I just need to resolve this Javascript issue.

My code (I've trimmed it down to just the contact form):

<!DOCTYPE html>
<html lang="en" dir="ltr">

<head>
    <meta charset="utf-8">
    <title>Catering</title>
    <!-- <link rel="stylesheet" href="contact-form.css"> -->
    <link rel="shortcut icon" type="image/png" href="media/logo.png"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <script src="https://sdk.amazonaws.com/js/aws-sdk-2.1053.0.min.js"></script>
    
</head>

<body>

<div id="page-container">
    <div id="content-wrap">

      <main>
        <div class="fcf-body">

            <div id="fcf-form">
            <h3 class="fcf-h3">Request a quote for your event</h3>
        
            <form id="fcf-form-id" class="fcf-form-class" onsubmit="LPAWS.sendToTopic(); return false;">
                
                <div class="fcf-form-group">
                    <label for="Name" class="fcf-label">Your name:</label>
                    <div class="fcf-input-group">

                        <input type="text" placeholder="Enter your name" id="Name" name="Name" class="fcf-form-control" required>
                    </div>
                </div>
        
                <div class="fcf-form-group">
                    <label for="Email" class="fcf-label">Your email address:</label>
                    <div class="fcf-input-group">

                        <input type="email" placeholder="Enter your email" id="Email" name="Email" class="fcf-form-control" required>
                    </div>
                </div>
        
                <div class="fcf-form-group">
                    <label for="Message" class="fcf-label">Your message:</label>
                    <div class="fcf-input-group">

                        <textarea id="Message" placeholder="Enter your message" name="Message" class="fcf-form-control" rows="6" maxlength="3000" required></textarea>
                    </div>
                </div>
        
                <div class="fcf-form-group">
                    <button type="submit" id="fcf-button" class="fcf-btn fcf-btn-primary fcf-btn-lg fcf-btn-block">Send Message</button>
                </div>
        
            </form>
            </div>
        
        </div>
      </main>

      
      <script type="text/javascript">
        var LPAWS = {};

        // Initialize the Amazon Cognito credentials provider
        AWS.config.region = 'us-east-1';
        AWS.config.credentials = new AWS.CognitoIdentityCredentials({
            IdentityPoolId: 'us-east-1:b99c6b09-64fe-4792-990e-9bb66ffca728',
        });

        var intro = "Name: "
        // Used to be document.querySelector('#Name') vvv
        var name = document.querySelector('#Name');
        var email = document.getElementById('Email').value;
        var message = document.getElementById('Message').value;
        var fullMessage = intro.concat(name, " \n ", "Email: ", email, " \n ", "Message: ", message, " \n ")

        LPAWS.sendToTopic = function() {
            var sns = new AWS.SNS();
            var params = {
                //Message: 'Hello topic', /* required */
                Message: fullMessage,
                // This will be the subject of the email vvv
                Subject: 'New Request from Website',
                TopicArn: 'arn:aws:sns:us-east-1:186570641799:EmailSeba'
            };
            // scoped to webpage URL with SNS access policy 
            sns.publish(params, function(err, data) {
                if (err) console.log(err, err.stack); // an error occurred
                else     console.log(data);           // successful response
            });
        };
    </script>

    </div>

  </div>

</body>
</html>