Four Ways to Reach a Model in Another Azure Region From Microsoft Foundry

Author(s): Dave R | Microsoft Azure & AI MVP ☁️ Originally published on Towards AI. How each pattern handles identity, routing, and private networking, and which Foundry features stop working when a gateway sits in the path. Microsoft Foundry model availability is regional, so the model or Foundry Agent Service feature you need can live outside the region your project was approved for. Foundry supports four ways to reach it, and they differ in who owns identity, routing, and the network path. One of them also makes first-party tools such as SharePoint grounding fail with bad_request. This guide compares all four patterns, shows the API Management option running on a fully private network, lists which features survive the hop, and ends with a decision flow you can apply to your own landing zone. Four patterns connecting a Foundry project in one Azure region to model deployments in another region.The article explains why cross-region model access is an ownership decision across three boundaries—control plane, identity, and the data path—and then details four supported patterns. Pattern 1 is a direct Foundry-to-Foundry connection that provides static model governance but cannot enfor…

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