Auto scaling group not publishing notification to a encrypted sns topic

Question

I have tested the integration between asg and my sns topic working without encryption.
However when I encrypted the sns topic with customer managed kms key, I'm no longer receiving notification from asg (confirmed from sns cloudwatch metrics), I have granted asg service permission to generate*, encrypt*, decrypt* permission on the key but still not working. Can you advice anything else I should check?

Reply to first comment:
The account already has full access to the key as admin. I also don't see any relevant cloudtrail event to that key except creation. `ASG might not be the service trying to publish to the topic` the reason I think it should be asg is before I add encryption I only grant asg permission to publish to the sns topic.

Answer

Try this ststement on the key policy:

"Statement": [
        {
            "Sid": "Allow Key utilization",
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::ACCOUNT_ID:root"
                ]
            },
            "Action": [
                "kms:Decrypt",
                "kms:GenerateDataKey*"
            ],
            "Resource": "*"
        },

That would allow all the services in the account to use encrypt/decrypt using the key, ASG might not be the service trying to publish to the topic.

Another thing that helps a lot is to check CloudTrail Event History around the time the message should have sent, including the "Error code" field

Auto scaling group not publishing notification to a encrypted sns topic

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