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Formerly known as Azure AI Services or Azure Cognitive Services is a unified collection of prebuilt AI capabilities within the Microsoft Foundry platform
How to fix foundry playground error ERR_BAD_RESPONSE Failed to authenticate to backend endpoint. RequestId =
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I deployed an instance of claude-sonnet-4-5 within my foundry project but when trying to test in the foundry playground, I consistently get the below error. I see the same for other Anthropic model deployments.
ERR_BAD_RESPONSE Failed to authenticate to backend endpoint. RequestId =
I also tested an existing deployment of gpt-5-model-router and that worked without error.
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