Error: Error retrieving DynamoDB table item validation exception

A ValidationException when retrieving an item means the request failed validation. A valid GetItem for a key that is not present succeeds without an Item field. Check the request’s key schema and format rather than inserting an item merely to suppress the error.

• Use the exact partition-key name and, when defined, the sort-key name. Include both values for a composite key and no unrelated attributes in Key.
• Match key types. Low-level clients need typed values such as {"S":"123"}; document APIs take native values.
• GetItem targets a table, not a secondary index. Use Query for an index lookup.
• If using ProjectionExpression, bind reserved or special names through ExpressionAttributeNames. Remove unused aliases. GetItem does not accept a filter or ExpressionAttributeValues.

Compare the failed request with DescribeTable under the same identity, Region, and endpoint. Repeated retries will not repair an invalid key. Handle an absent Item as the separate, normal “not found” outcome.

See GetItem with no result and AWS documentation.