I have a Windows app to deploy on Surface tablet using Microsoft MDM/MAM solution: InTune. This app requires user authentication to be used.
Thanks
Firstly, please note that the MAM policies are only supported on IOS and Android devices at this moment. A windows app in your case are not applicable for MAM.
As far as I know, there's no built-in features in Intune for handling User authentication. Users in Intune use Azure AD for authentication actually. However, you can use Azure AD and ADFS to achieve functions like SSO, Multi-factor authentication, conditional access, etc.