Unable to upload the outputs - Access Is Forbidden

When I try to create a rendition I am getting the following error:

{
  code: 403,
  details: [
    {
      name: 'https://s3.amazonaws.com/...',
      reason: 'Unable to upload the outputs'
    }
  ],
  title: 'Access Is Forbidden',
  type: 'AuthForbidden'
}

Here is the code I'm using:

const util = require('util');
const stream = require('stream');
const pipeline = util.promisify(stream.pipeline);
const sdk = require('@adobe/aio-lib-photoshop-api');

createRenditionOfPSD() {

      // GENERATE A NEW TOKEN
      const authDetails: string = await this.generateIMSToken(clientIdAndApiKey, clientSecret);
      let authInfo = JSON.parse(authDetails);
      authToken = authInfo.access_token;

      // CREATE PS API OBJECT
      const client = await sdk.init(ims, clientIdAndApiKey, authToken);

      // GET SIGNED URL
      var signedPSDGetURL = await getSignedUrl(key, bucket);

      // CREATE SIGNED URL FOR SAVING THE OUTPUT
      var psdImageKey = "output-of-rendition" + ".png";
      //var signedOutputURL = await getSignedPutUrl(psdImageKey, bucket);
      var signedOutputURL = await getSignedPostUrl(psdImageKey, bucket);

      // CREATE DOCUMENT RENDITION
      var psdInputOptions = {
        href: signedPSDGetURL,
        storage: sdk.Storage.EXTERNAL
      }

      var psdOutputOptions = {
        href: signedPutURL,
        type: sdk.MimeType.PNG,
        storage: sdk.Storage.EXTERNAL,
        overwrite: true
      }

      const renditionResults = await client.createRendition(psdInputOptions, psdOutputOptions);
      console.log(renditionResults);

      var outputs = psdRenditionResults.outputs;

      for (var output in outputs) {
        var outputItem = outputs[output];
        var status = outputItem.status;

        if (status=="failed") {
          var errors = outputItem.errors;
          console.log(errors);
        }
        log(output)
      }
}

The results:

Job {
  getJobStatus: [Function: bound __getJobStatus] AsyncFunction,
  url: 'https://image.adobe.io/pie/psdService/status/....',
  jobId: '...',
  outputs: [
    {
      input: 'https://s3.amazonaws.com/...',
      status: 'failed',
      created: '...',
      modified: '...',
      errors: [Object]
    }
  ],
  _links: {
    self: {
      href: 'https://image.adobe.io/pie/psdService/status/...'
    }
  }
}

The get signed PUT url and get signed Post URL are below:

export async function getSignedPutUrl(key: string, bucket: string, expireAfterMinutes: number = 0, options = null):Promise<string>{
    const s3 = new AWS.S3();
    var params = {
        Bucket: bucket,
        Key: key
    };

    if (options) {
        params = Object.assign(params, options);
    }

    const url = await s3.getSignedUrlPromise('putObject', params);
    return url;
}

export async function getSignedPostUrl(key: string, bucket: string, expireAfterMinutes: number = 0, options = null):Promise<string>{
    const s3 = new AWS.S3();
    var params = {
        Bucket: bucket,
        Fields: {
          Key: key,
          ContentType: "application/octet-stream",
        }
    };

    if (options) {
        params = Object.assign(params, options);
    }

    const presignedPost = await s3.createPresignedPost(params);
    const url = presignedPost.url;
    return url;
}

adobe / aio-lib-photoshop-api

Unable to upload the outputs - Access Is Forbidden #41