Is anyone else having problems with Plaid's linkTokenCreate method? I'm using node.js as the backend and when I run it alongside the frontend, the error starts on the line involving this function.

Even when I use the standard quickstart options, I still get the same 400 bad request error.

This is the backend code, same as the quickstart. I'm just testing for the link token, so its the only route I've defined.

app.post('/create_link_token', function (request, response, next)  {
    console.log('HI THERE')
    Promise.resolve()
    .then(async function () {
        const configs = {
            user: {
                //this should be a unique id for the current user.
                client_user_id: 'user-id',
            },
            client_name: 'Plaid Quickstart', 
            products: PLAID_PRODUCTS, 
            country_codes: PLAID_COUNTRY_CODES, 
            language: 'en',
        };

        console.log(configs);

        // if (PLAID_REDIRECT_URI !== '') {
        //     configs.redirect_uri = PLAID_REDIRECT_URI;
        // };

        const createTokenResponse = await client.linkTokenCreate(configs);
        console.log(createTokenResponse);
        prettyPrintResponse(createTokenResponse);
        response.json(createTokenResponse.data);
        
    })
    .catch(next);
});

and this is the error:

Error: Request failed with status code 400
    at createError (C:\Users\MyComputer\Desktop\mukadi\plaid-integration\backend\node_modules\axios\lib\core\createError.js:16:15)
    at settle (C:\Users\MyComputer\Desktop\mukadi\plaid-integration\backend\node_modules\axios\lib\core\settle.js:17:12)
    at IncomingMessage.handleStreamEnd (C:\Users\MyComputer\Desktop\mukadi\plaid-integration\backend\node_modules\axios\lib\adapters\http.js:269:11)      
    at IncomingMessage.emit (node:events:402:35)
    at endReadableNT (node:internal/streams/readable:1343:12)
    at processTicksAndRejections (node:internal/process/task_queues:83:21)