A Step Functions Task state calling DynamoDB PutItem fails with a permissions error. What is the most likely cause?

medium📝 Debug Q6 of 15

DynamoDB - with Serverless

AThe IAM role used by Step Functions lacks PutItem permission on the table

BThe DynamoDB table name is misspelled in the Parameters

CThe Item attribute values are missing data types like 'S' or 'N'

DThe Task state type is incorrectly set to 'Pass'

Step-by-Step Solution

Solution:

Step 1: Identify cause of permissions error
Permissions errors usually mean the IAM role lacks required DynamoDB action rights.
Step 2: Check other options
Misspelled table or missing data types cause different errors; Task type 'Pass' would not call DynamoDB.
Final Answer:
The IAM role used by Step Functions lacks PutItem permission on the table -> Option A
Quick Check:
Permissions error = missing IAM PutItem rights [OK]

Quick Trick: Check IAM role permissions first on DynamoDB errors [OK]

Common Mistakes:

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