What is the MOST likely cause of these issues?
The command is incorrect; it should be rewritten to use put-item with a string argument.
The developer needs to log a ticket with AWS Support to enable access to the demoman-table.
Amazon DynamoDB cannot be accessed from the AWS CLI and needs to be called via the REST API.
The IAM user needs an associated policy with read access to demoman-table.
Explanations:
The command is correctly structured to useget-item, which is appropriate for retrieving data from a DynamoDB table. The suggestion to useput-itemis not relevant here, asput-itemis for adding or updating items in the table, not retrieving them.
There is no need to log a ticket with AWS Support just to access the table. The issue is likely related to permissions or the configuration of the IAM user, not an account-wide restriction.
Amazon DynamoDB can be accessed from the AWS CLI, and the CLI is simply a wrapper around the underlying REST API. This statement is misleading, as it suggests a fundamental limitation that does not exist.
The IAM user must have the appropriate permissions to access the DynamoDB table. If the user does not have a policy that grants read access todemoman-table, theget-itemcommand will fail, resulting in no data being returned. This is the most likely cause of the issue.
I arrange that the answer is:
The IAM user needs an associated policy with read access to demoman-table.