Control Tower dependency to other regions?

Question

My customer wanted to launch the Control Tower in eu-west-1 but the launch failed. 
After he went through the support case, the identified problem was that the customer has disabled STS (in IAM) for all regions except eu-west-1 and the global one (us-east-1). He needed to additionally enable us-east-2 and us-west-2 regions.

He is asking why he needs to enable us-east-2 and us-west-2 for Control Tower when he is not using these regions? Is there some dependency that Control Tower has to these regions?

Thanks

Accepted Answer

Control tower rolls out Guard rails in these 4 regions.

You can see this e.g. when you look at the Cloudformation StackSets in the CT payer account, like **AWSControlTowerBP-BASELINE-CONFIG**. This StackSet contains stack instances for every managed accounts in these 4 regions.

If STS is disabled in these regions then CloudFormation cannot assume the right role to deploy the template and therefore your account deployment / baselining will fail.

Control Tower dependency to other regions?

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