OAuth2 with Azure AD - Not getting user consent

The problem you are running in to is that the tenant you are using to access your app has not added your application to the list of applications that are supported. It's telling you to use the interactive flow as an administrator.

Consent is a two step process:

1) First, the administrator of the tenant must approve the app. This can be done either 1) in the Azure portal of the tenant wishing to use the app or 2) by launching the app and using admin credentials against the app when you sign in.

Example of the Azure portal approval:

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2) Second, any additional user (non-admin) will be promoted to consent for their individual information when using the app for the first time after the admin has consented that the app can be used.

Try giving resource as 'https://graph.windows.net' in the post request.

It worked for me.