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Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
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Hello Bert!
Are you trying to access an application using your personal account? Typically this error occurs when the application is registered to allow only work or school (organizational) accounts, but the user is signing in with a personal Microsoft account (for example, Outlook.com or MSN), which isn’t permitted by the app’s current configuration.
To resolve it, please request the application owner to update the app registration to support personal Microsoft accounts (or both organizational and personal accounts) under Supported account types in Microsoft Entra ID. Alternatively, please use your work or school account to sign in to the application.
See the official guidance here: https://learn.microsoft.com/entra/identity-platform/supported-accounts-validation