| Error Code | 900439 |
| Message | Confidential Client requests are not supported on the public endpoint (login.microsoftonline.com) for tenants in the Azure Government cloud. Send your login requests to https://login.microsoftonline.us instead. Please see https://devblogs.microsoft.com/azuregov/azure-government-aad-authority-endpoint-update/ for more details |
| Remediation | Starting May 5th 2020, Azure AD began enforcing the change in login endpoints for Azure Government that was announced April 3rd, 2018. The app must be updated to sign in users to the US Government cloud instead of the public cloud. |