can't delete StackSets in CloudFormation

To delete a StackSet, you must first delete all stack instances in the stack set. The "StackSet is not empty" error suggests this hasn't been done yet.

With AWS Copilot, the credentials you use will require sts:AssumeRole permissions on the EnvManagerRoles for any environment you are working with.

In the IAM console, confirm that the trusted entities under EnvManagerRole shows your user as a trusted entity. The trust relationship should look something like this:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": [
          "arn:aws:iam::9*********:user/zavier.lau@t*******is"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}