Can I use a CfnOutput of a stage in the pipeline stack?

[jhummel]

I'm trying to get the bucketName prop from an S3 bucket that is created in a pipeline stage, and use that property to lookup the bucket in the pipeline. I pass the bucket into a custom step I created to deploy some files to the bucket as a poststep of the stage.

I'm trying to generate a CfnOutput with an exportName in the stack/stage and then use the importValue of the output in the pipeline. I use the value in a Bucket.fromBucketAttributes call to get the bucket and then pass the bucket into the custom step

When I try to access my CfnOutput.importValue in the pipeline, I get an error 'No export named xxx found' Is there any way for me to get the value from my stage in the pipeline?

Stack

export class MyStack extends Stack {
  constructor() {
    const bucket = new aws_s3.Bucket(this, name, { bucketName: PhysicalName.GENERATE_IF_NEEDED })
    this.bucketName = new CfnOutput(this, 'bucket_name', { 
      exportName: 'frontend-bucket-name',
      value: bucket.construct.bucketName
    });
  }
}

Stage

export class MyStage extends Stage {
  constructor() {
    const backend = new MyStack(this, 'my-backend-stack', props);
    this.bucketName = backend.bucketName;
  }
}

Pipeline

export class MyPipeline extends Stack {
  constructor() {
    const source = CodePipelineSource.connection(repo, branch, { connectionArn });
    const synth = new CodeBuildStep('Synth', { input: source, commands: [..., 'cdk synth'] });
    
    // My tooling gets deployed in a different account than the pipeline
    const infrastructure = new MyStage(this, 'Infrastructure', { env: { account: 'xxx', region: 'xxx' })
    const pipeline = new CodePipeline(this, id, { crossAccountKeys: true, synth});

    // I need to get the CfnOutput to get the bucket for a postStep
   // This gives me an error - No export named frontend-bucket-name found
    const bucket = aws_s3.Bucket.fromBucketAttributes(this, 'frontend-bucket', {
      bucketName: infrastructure.bucketName.importValue,
      account: 'xxx'
    });

    // This is a custom step I created where I need the bucket to deploy some files
    // This will be used as a postStep after my stage
    const s3Deploy = new S3DeployStep(someFileSet, bucket);

    pipeline.addStage(infrastructure, {
      post: s3Deploy
    });
  }
}

[jhummel]

Ugh. I just realized it's probably an issue with my resources being deployed into a different account. I'm guessing it can't lookup across the accounts, can anyone confirm?