Adding an unsubscribe link when sending an email on form submission via SendGrid v3

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Hi,
I have been successfully sending transactional emails on form submission but I have only just realised that the unsubscribe link is not working!

After speaking with someone at SendGrid, I need to define the unsubscribe group in my API request so I have added the asm (advanced suppression manager) parameter and group_id (id of the unsubscribe group) to my sendgrid.js, email.jsw and page code but with no luck.

Is anyone able to help me out?

//sendgrid.js

export function sendInstruction(key, sender, recipient, templateID, groupID) {  
 const url = "https://api.sendgrid.com/v3/mail/send";

 const MyHeaders = {
 "Authorization": "Bearer " + key,
 "Content-Type": "application/json"
    };

 const MyBody = {
 
 "personalizations": [{
 "to": [{
 "email": recipient
            }]
        }],

 "from": {
 "email": sender
        },

 "asm": {
 "group_id": groupID
        },
 
 "template_id": templateID,
 
    };

return fetch(url, {
 "method": "POST",
 "headers": MyHeaders,
 "body": JSON.stringify(MyBody)
        })
        .then(Response => Response.text);
}

//email.jsw

export function sendMarketingEmail(recipient, templateID, GroupID) { 
const key = "XXXX API KEY XXX"; 
const sender = "email@email.com";
return sendInstruction(key, sender, recipient, templateID, GroupID);
}

page code

import { sendMarketingEmail } from 'backend/email';

function sendToRecipient() {

  const recipient = $w("#inputRecipientEmail").value;
  const groupID = "7954"
  const templateID = $w("#ddEmailCampaign").value;
  sendMarketingEmail(recipient, templateID, groupID)
        .then(response => console.log($w("#ddEmailCampaign").value, response));

}

Thanks in advance,
Rachel