Teleskope needs read access to scan and classify your data stored in DynamoDB.
Attach the AmazonDynamoDBReadOnlyAccess to the Teleskope role you created.
resource "aws_iam_role_policy_attachment" "dynamodb_policy" {
role = "TeleskopeRole"
policy_arn = "arn:aws:iam::aws:policy/AmazonDynamoDBReadOnlyAccess"
}