++ When you're using AI services keys [to attach your multi-service resource to your skillset](cognitive-search-attach-cognitive-services.md#bill-through-a-resource-key) via the REST API, both your Azure AI Search service and AI multi-service resource must be in the same region. This is only possible in the Azure regions of **East US**, **West Europe**, **North Central US**, **West US 2**. But if you're using a managed identity for [billing through a keyless connection](cognitive-search-attach-cognitive-services.md#bill-through-a-keyless-connection), your Azure AI Search service must be in one of the following regions: **East US**, **West Europe**, **North Central US**, **West US 2**. On the other hand, you can use AI Document Intelligence through an Azure AI multi-service resource in any region where this service is available. See [Product availability by region](https://azure.microsoft.com/explore/global-infrastructure/products-by-region/table).
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