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Hello,
You need to create an IAM role in the source account to allow publish message to the SNS topic in the target account. In the target account, create a SNS resource based policy to allow access to the IAM role which was created in the source account. Please refer the below doc if it helps.
https://aws.amazon.com/premiumsupport/knowledge-center/sns-cross-account-ec2-instance-iam-role/
answered a year ago
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These are SNS Mobile PlatformApplication arn, and these doesn't has a resource-based policy as far as I can see in AWS Console! I updated my question with more details.