How do I set Amazon SNS as Notification(Channel) in an Amazon Opensearch???

I want to opensearch notification to Amazon sns. This is my setting

1. creat Notification in Opensearch

2. add permission in my IAM following this page https://opensearch.org/docs/latest/observing-your-data/notifications/index/

3. send test message I created alert in Amazon Opensearch and them sent test message

4. failed!! this is return message

{ "event_status_list": [ { "config_id": "{{ID}}", "config_type": "sns", "config_name": "test-os", "email_recipient_status": [], "delivery_status": { "status_code": "424", "status_text": "SNS service Error(403), Service status:(Client)AccessDenied:User: arn:aws:sts::832035452523:assumed-role/cp-sts-grant-role/swift-ap-northeast-2-prod-913369500992 is not authorized to perform: sts:AssumeRole on resource: arn:aws:iam::{{my account}}:user/{{my account}}" } } ] }

How to resolve this problem?