An error occurs when authenticating a user on Azure AD using the Resource Owner Password Grant (ROPG) flow through Auth0. This issue happens when the Microsoft Identity Platform (v2) is active in the connection settings. To resolve this, change the configuration to use Azure Active Directory (v1).

When this issue occurs, the system generates the following error:

{"error":"invalid_request","error_description":"specified strategy does not support requested operation (undefined)"}

• Azure AD
• ROPG Flow
• Native Applications

How to resolve the Azure AD for ROPG flow in Auth0?

Change the Auth0 connection settings to use Azure Active Directory (v1) to resolve the ROPG flow error.

1. Navigate to the Auth0 Dashboard.
2. Go to the Azure AD connection settings.
3. Select Azure Active Directory (v1).

NOTE: For detailed implementation steps, review the Auth0 documentation on Connecting Native Apps to Microsoft Azure Active Directory Using Resource Owner Flow.