[Python / Lambda] boto3 sqs client raise botocore.exception.ClientError(Access Denied)

[ENV] Trigger Lambda -> ap-northeast-2 SQS queue -> ap-northeast-1 Crawler EC2 -> ap-northeast-1

[Pipeline] Trigger Lambda -> send_message -> SQS queue -> Crawler EC2

[Permission] Trigger Lambda -> queue.grant_send_messages(trigger_lambda) Crawler EC2 -> queue.grant_consume_messages(crawler_cluster_worker)

[Owner] ALL -> root account

[Python Code in Trigger Lambda] sqs_client.send_message( QueueUrl=CRAWLER_SQS_MESSAGE_QUEUE_URL, MessageBody=json.dumps(sqs_message) )

[Trigger Lambda's Error Detail] [ERROR] ClientError: An error occurred (AccessDenied) when calling the SendMessage operation: Access to the resource https://sqs.ap-northeast-1.amazonaws.com/ is denied. Traceback (most recent call last): File "/var/task/main.py", line 136, in lambda_handler raise e File "/var/task/main.py", line 116, in lambda_handler sqs_client.send_message( File "/var/task/botocore/client.py", line 530, in _api_call return self._make_api_call(operation_name, kwargs) File "/var/task/botocore/client.py", line 960, in _make_api_call raise error_class(parsed_response, operation_name)

[Question] The trigger lambda failed an sending sqs message always succeeded. There are no issues with permissions and regions. It is judged to be a temporary error. Can you tell me what could be the reason for the temporary error?