SSO : write a permission that limit actions to all accounts in OU

Question

In IAM identity center (AWS SSO), I would like to create a permission that authorizes actions only on accounts belonging to a specific OU. What resources and conditions should I put in?

Answer

Hello.

As far as I know, I don't think it's possible to allow an IAM identity center user to perform actions only on a specific OU.  
IAM identity center users are allowed to perform actions on the AWS accounts they have been granted access to.  
Therefore, I think it would be a good idea to not link the IAM identity center user to any AWS account other than the required AWS account.  
https://docs.aws.amazon.com/singlesignon/latest/userguide/useraccess.html

SSO : write a permission that limit actions to all accounts in OU

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