You can attach a resource-based policy directly to the resource in the other AWS account . E.g.; S3 bucket, SNS topic, or DynamoDB.
This policy grants your Lambda function permission to access the resource from another account.
Yes, AWS Organizations simplifies cross-account access.
Modify the Key Policy
It is forcefully terminated by AWS. This can lead to data loss, service disruption, or incomplete transactions if not handled properly
Lambda concurrency controls