Cross-account resource permissions - Amazon Application Recovery Controller (ARC)
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Cross-account resource permissions

If resources are in different accounts, you'll need a cross-account role. The following is a sample trust policy for a cross-account role.

JSON
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::123456789012:role/RegionSwitchExecutionRole"
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "sts:ExternalId": "UniqueExternalId123"
        }
      }
    }
  ]
}

And the following is the permission for the plan execution role to assume this cross-account role:

JSON
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "sts:AssumeRole",
      "Resource": "arn:aws:iam::987654321098:role/RegionSwitchCrossAccountRole",
      "Condition": {
        "StringEquals": {
          "sts:ExternalId": "UniqueExternalId123"
        }
      }
    }
  ]
}