Meta API with User Token Returns Empty Response

Here are the steps I took to get access_token

// Init FB SDK const loadSdk = () => {     window.fbAsyncInit = function () {         window.FB.init({             appId: "218446344509498",             cookie: true,             xfbml: true,             version: "v19.0",         });     };     if (!document.getElementById("facebook-jssdk")) {         const js = document.createElement("script");         js.id = "facebook-jssdk";         js.src = `https://connect.facebook.net/en_US/sdk.js`;         document.body.appendChild(js);     } }; loadSdk(); 

Then I opened the popup that I need for whatsapp embedded sign up

window.FB.login((response) => {     if (response.authResponse) {         const code = response?.authResponse?.code;         console.log(code)     } }, {     config_id: <config-id>, // configuration ID goes here     response_type: "code",     override_default_response_type: true,     scope: 'business_management, whatsapp_business_management, whatsapp_business_messaging', }) 

When I code the code I retrieved my access_token on the server side using the following API

https://graph.facebook.com/v20.0/oauth/access_token?client_id=<client-id>&client_secret=<client-secret&code=<code-i-previously-retrived> 

This returns me an access token that seems to be working with Meta APIs /me, //owned_whatsapp_business_accounts But it returns empty arrays or objects.

When I do the same thing from Meta explorer (select permissions, generate token, copy that token and use, it works)

I have been trying to solve this since many days and not sure where I am doing the mistake.

I want to generate token with correct permissions (it looks like I am doing it because authentication popup also mentions the permissions I requested), and want to able to fetch information from it not empty array