PermissionsBoundary

Specifies the configuration of the AWS managed or customer managed policy that you want to set as a permissions boundary. Specify either CustomerManagedPolicyReference to use the name and path of a customer managed policy, or ManagedPolicyArn to use the ARN of an AWS managed policy. A permissions boundary represents the maximum permissions that any policy can grant your role. For more information, see Permissions boundaries for IAM entities in the IAM User Guide.

Policies used as permissions boundaries don't provide permissions. You must also attach an IAM policy to the role. To learn how the effective permissions for a role are evaluated, see IAM JSON policy evaluation logic in the IAM User Guide.