# Troubleshoot multi-Region setup in Amazon IAM Identity Center
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This topic describes common multi-Region setup related errors you might encounter when using Amazon IAM Identity Center and provides troubleshooting steps to resolve them.

## The Region I want to replicate my IAM Identity Center instance to is not available in the IAM Identity Center console
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You must first create a replica key for your customer managed KMS key in the Region you want to replicate your IAM Identity Center instance to. Once the replica key is created, you will see the Region in the list of Regions available for replications. For more information, see [Step 1: Create a replica key in the additional Region](replicate-to-additional-region.md#replicate-kms-key).

## Amazon managed application sign-in failures in an additional Region
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If no IAM Identity Center users can sign into Amazon managed applications in an additional Region after you added the Region in IAM Identity Center, confirm that you configured the additional Region's Assertion Consumer Service (ACS) URL in the external identity provider as described in [Step 3: Update external IdP setup](replicate-to-additional-region.md#update-external-idp-setup). Also, confirm your users have connectivity to the Region.