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Microsoft Entra application used an unsupported grant type

AADSTS70003: UnsupportedGrantType

Microsoft Entra rejected the token request because the app used a grant type that is not supported by the endpoint or app configuration.

AADSTS70003authentication

Observed message

AADSTS70003: UnsupportedGrantType

Why it happens

  • The app requested a token using an unsupported grant type.
  • The app is calling the wrong endpoint for the intended OAuth flow.
  • The app configuration and auth flow do not match.

How to fix it

  1. Review the OAuth grant type used by the client.
  2. Make sure the request is sent to the correct Microsoft Entra endpoint for that flow.
  3. Update the app configuration so it supports the intended authentication flow.

Official reference

Microsoft Learn: Microsoft Entra authentication and authorization error codes

Related errors

AADSTS700016Microsoft Entra application identifier was not foundAADSTS70001Microsoft Entra application is disabledAADSTS70007Microsoft Entra application used an unsupported response modeAADSTS70005Microsoft Entra application used an unsupported response type

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AADSTS70003 UnsupportedGrantType: causes and fixes | Error Atlas