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There could be several possible reasons why the item is not being added to the table when using put and putItem functions in conjunction with AWS Lambda and DynamoDB. Some of the most common reasons are:

1. Incorrect IAM permissions: AWS Lambda needs appropriate IAM permissions to access DynamoDB. Make sure that your Lambda function has the correct IAM role and permissions to access the DynamoDB table.

2. Incorrect table or key name: Make sure that you're specifying the correct table name and primary key (partition key or sort key) while using the put and putItem functions.

3. Incorrect data format: Check the data format and structure of the item being inserted into the table. Make sure that the data is in the required format and matches the table schema.

4. Unhandled exceptions: The put and putItem functions may throw exceptions if there are any errors in the input data or if the DynamoDB table is not available. Make sure that you're handling these exceptions appropriately in your Lambda function.

5. Missing required attribute values: DynamoDB requires all items to have at least one primary key attribute value, and secondary indexes may require additional attributes. Make sure that all required attribute values are provided while inserting the item into the table.

By troubleshooting these issues, you should be able to figure out why the item is not being added to the table when using the put and putItem functions in conjunction with AWS Lambda and DynamoDB.