It is possible that there is a mismatch between IAM deployment and App deployment in S3 bucket names.

Step-by-step guide

  1. Click IAM.
  2. Click a role that starts with sdt-cumulus-*. For example, sdt-cumulus-lambda-api-gateway
  3. Expand a Policy.
  4. Click S3.
  5. Click ListBucket.


IAM Deployment puts sandbox prefix in bucket name. If the bucket doesn't exist, you need to create them manually.