"Query condition missed key schema element" when querying DynamoDB from Step Function

Question

I'm trying to query a DynamoDB table in a Step Function but it's throwing the following error.

Query condition missed key schema element: Scope (Service: DynamoDb, Status Code: 400, Request ID: FN4G...)

The Step Function Task definition is;
```
    "Obtain user list": {
      "Type": "Task",
      "Parameters": {
        "TableName": "Users",
        "KeyConditionExpression": "#Scope = :Global",
        "ExpressionAttributeNames": {
          "#Scope": {
            "S": "Scope"
          }
        },
        "ExpressionAttributeValues": {
          ":Global": {
            "S": "Global"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
      "Next": "Pass"
    },
```

The DynamoDB definition is;
![Tabel settings](/media/postImages/original/IM1D-csEKnQZSOo4v3JU5BKw)

And here's a sample item from the table
```
{
  "Scope": {
    "S": "Global"
  },
  "ServiceName": {
    "S": "driver"
  },
  "lastVisitDateTime": {
    "N": "1680022106"
  },
  "Status": {
    "S": "ONLINE"
  }
}
```

Any pointers on what I'm missing??  Thanks!

[1]: https://i.stack.imgur.com/rOpsg.png

Accepted Answer

Ah!   I was able to get it working using KeyConditions

```
{
  "Type": "Task",
  "Parameters": {
    "TableName": "Users,
    "KeyConditions": {
      "Scope": {
        "ComparisonOperator": "EQ",
        "AttributeValueList": [
          {
            "S": "Global"
          }
        ]
      }
    }
  },
  "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
  "Next": "Pass"
}
```

"Query condition missed key schema element" when querying DynamoDB from Step Function

Relevanter Inhalt