AWS DMS [Failed to fetch metadata.', 'failure_message': 'Internal failure.]というエラー

AWS DMSのサーバーレスレプリケーションを作成してから実施して下記のログが出ました。

{'replication_state':'initializing', 'message': 'Initializing the replication workflow.'}
{'replication_state':'preparing_metadata_resources', 'message': 'Preparing the resources for metadata collection. This can take some time.'}
{'replication_state':'testing_connection', 'message': 'Completed preparing resources for metadata collection. Testing connection to source and target endpoints to ensure proper configuration.'}
{'replication_state':'fetching_metadata', 'message': 'Fetching metadata from your source endpoint to calculate workload capacity.'}
{'replication_state':'failed', 'message': 'Failed to fetch metadata.', 'failure_message': 'Internal failure.'}
{'replication_state':'failed', 'message': 'Failed to fetch metadata.', 'failure_message': 'Internal failure.'}
{'replication_state':'fetching_metadata', 'message': 'Fetching metadata from your source endpoint to calculate workload capacity.'}
{'replication_state':'fetching_metadata', 'message': 'Fetching metadata from your source endpoint to calculate workload capacity.'}
{'replication_state':'calculating_capacity', 'message': 'Calculating workload capacity for your replication based on table mappings and source metadata.'}
{'replication_state':'provisioning_capacity', 'message': 'Fetching workload capacity to provision your replication.'}
{'replication_state':'provisioning_capacity', 'message': 'Provisioning 16 capacity units to perform the replication. This can take some time.'}

'Failed to fetch metadata.', 'failure_message': 'Internal failure.'について具体的にどんな問題でしょうか。 どのように解決するかご教授ください。