Receiving Error “AADSTS900439 – USGClientNotSupportedOnPublicEndpoint”

Bhavya Vootla [MSFT]

Problem: This blog provides more information about the error “AADSTS900439 – USGClientNotSupportedOnPublicEndpoint”.  This error typically occurs when a user uses a public cloud endpoint to sign in to an application registered in Azure Government sovereign cloud. It is known fact that the official Azure Active Directory (AAD) Authority for Azure Government changed from `https://login-us.microsoftonline.com` to `https://login.microsoftonline.us`. This change also applied to Microsoft 365 GCC High and DoD, which Azure Government…

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