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169.254.169.254 is a special link-local address reserved for metadata services. It is not reachable from the public internet — only from within the virtual network of the cloud provider or from the instance itself.
AWS has released IMDSv2 specifically to mitigate this SSRF vector. make changes to DynamoDB
This feature is commonly used in deployment scripts running on EC2 instances to access AWS resources securely. For example, an EC2 instance might use these credentials to upload logs to S3, make changes to DynamoDB, or process data in SQS queues. or process data in SQS queues.