What is wrong with the following code snippet that tries to put an item into DynamoDB?

What is wrong with the following code snippet that tries to put an item into DynamoDB?

import { DynamoDBClient, PutItemCommand } from '@aws-sdk/client-dynamodb';
const client = new DynamoDBClient({ region: 'us-east-1' });

async function putItem() {
  const command = new PutItemCommand({
    TableName: 'Users',
    Item: { UserId: '123', Name: 'Alice' }
  });
  await client.send(command);
}
putItem();