AWS Certifiied Security Specialty Category

Hello good morning. Am currently in Module 2 and trying to get past question number 3 " 3. You have created an Amazon EventBridge rule to alert your team via SNS and email whenever someone deletes a KMS Key. You have verified that the events are delivered to EventBridge and that it matches the rule, but you are not receiving any Emails from SNS. You investigate the SNS topic and notice that it is ___________ and you must update the KMS key policy to publish messages to this SNS topic."

i have been stuck for about 2 hours. Can some please assist?