我在lambda中跟踪boto3代码以通过STS凭据访问Dynamo db表时出错。代码如下

import boto3
def lambda_handler(event, context):
sts_client = boto3.client('sts')

# Call the assume_role method of the STSConnection object and pass the role
# ARN and a role session name.
assumedRoleObject = sts_client.assume_role(
    RoleArn="arn:aws:iam::012345678910:role/test_role",
    RoleSessionName="AssumeRoleSession1"
)

# From the response that contains the assumed role, get the temporary
# credentials that can be used to make subsequent API calls
credentials = assumedRoleObject['Credentials'] 


dynamoDB = boto3.resource('dynamodb',aws_access_key_id=credentials['AccessKeyId'],aws_secret_access_key=credentials['SecretAccessKey'],aws_session_token=credentials['SessionToken'],)
test1=dynamoDB.get_available_subresources

table = dynamoDB.Table('Test1')

response = table.get_item(
    Key={
            'Name': 'ABC'
        }
    )

ResourceNotFoundException: An error occurred (ResourceNotFoundException) when calling the GetItem operation: Requested resource not found