How to authenticate Azure Service Management Requests via AAD

问题

I've tried 3 ways with no result:

According to this article https://msdn.microsoft.com/en-us/library/azure/ee460782.aspx I've registered new web application in AAD with permissions to Access Azure Service Management API (steps 1-9) and written the recommended two lines of code to acquire the token:

    var context = new AuthenticationContext($"https://login.windows.net/{tenantId}");
    var result = context.AcquireToken("https://management.core.windows.net/", clientId, new Uri(redirectUri));

, but it fails with the exception:

Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException was unhandled
Message: An unhandled exception of type 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException' occurred in Microsoft.IdentityModel.Clients.ActiveDirectory.dll
Additional information: AADSTS90014: The request body must contain the following parameter: 'client_secret or client_assertion'.
Trace ID: aa2d6962-5aea-4f8e-bed4-9e83c7631887
Correlation ID: f7f1a61e-1720-4243-96fa-cff182150931

Also I've tried:

    var context = new AuthenticationContext($"https://login.windows.net/{tenantId}");
    var result = context.AcquireToken("https://management.core.windows.net/", new ClientCredential(clientId, clientSecret));

where clientSecret is secret app key of my application. This version returns a token, but requests with this token returns 403 Forbidden:The server failed to authenticate the request. Verify that the certificate is valid and is associated with this subscription.

The last, I've found http://blogs.msdn.com/b/cloud_solution_architect/archive/2015/03/02/authenticating-azure-service-management-api-with-azure-ad-user-credentials.aspx, which recommends:

    var context = new AuthenticationContext(string.Format("https://login.windows.net/{0}", tenantId));

    // TODO: Replace with your Azure AD user credentials (i.e. admin@contoso.onmicrosoft.com)
    string user = "{YOUR-USERID]";
    string pwd = "{YOUR-USER-PASSWORD}";
    var userCred = new UserCredential(user, pwd);

    AuthenticationResult result =
    await context.AcquireTokenAsync("https://management.core.windows.net/", clientId, userCred);

but it also fails with the same exception as in the first case...

Could you please assist me?