How to Upload Video to Pinterest via API

I am trying to upload a video to Pinterest, so I followed the instructions in their docs here

Here is how I attempted the upload

let headers = {
      'Authorization': `Bearer ${access_token}`
}
let videoUploadIntentEndpoint = `https://api.pinterest.com/v5/media`;
let videoUploadIntentResponse = await axios.post(videoUploadIntentEndpoint,
    {
        "media_type": "video"
    },
    {
        headers: headers
    }
);
let { media_id, upload_parameters, media_type, upload_url } = videoUploadIntentResponse.data;
if (media_id && upload_url) {
    try {
        let vidUploadParams = new URLSearchParams();
        vidUploadParams.append("file", got.stream(mediaUrl));
        let videoUploadResponse = await axios.post(upload_url, vidUploadParams, {
            headers: { ...upload_parameters }
        });
        let vidData = videoUploadResponse.data;
        console.log(`Pinterest Video Successful with Data`);
        console.log(JSON.stringify(vidData, null, 2));
    } catch (vidError) {
        console.log(`Pinterest Video Upload Error`);
        console.log(vidError);
    }
}

And the error I keep getting back is

AccessDeniedNo AWSAccessKey was presented.AFHHW0M2afafafR9N8afafafafafafa+g5y3qsXqKwta0eN6ND03J7UDEjpk4F1/qbFrfec=

How can I resolve this?

Thanks