I am trying out orbit , on clicking the deploy button on repo's readme, the pipeline starts and fails immediately due to S3 privilege access.
As pipeline creates its own role, it has the PowerUserAccess Role which have S3 policy added to it. So not able to figure out the issue.
Giving S3:ListObject error for bucket aws-orbit-workbench-public-us-east-1 using this config https://aws-orbit-workbench-public-us-east-1.s3.amazonaws.com/deploy/trial_pipeline_cfn.yaml
I have confirmed that PowerUserAccess is indeed set. By the way, is "aws-orbit-workbench-public-us-east-1" an S3 bucket managed by your AWS account? If this S3 bucket is not under your control, I would not be surprised if the deployment fails.
Another thing to check is that you have not created a deny rule in the bucket policy of the S3 bucket.