How to verify if user has deleted or password has changed in AAD in a Windows 8.1 Store app

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I am developing a Windows Store 8.1 app using C# and xaml.

I have integrated log in authentication with Azure Active Directory single sign-on using .Net Back end mobile service

Case 1: I have added a few users in Azure Active Directory and logged in with the "User X" credentials in the app. When I delete that User X, in AAD, and I try to reopen the app, it is saying that User X is logged in, even though the user is deleted in AAD. After 1 hour it is asking the user to log in.(Is this the minimal time required to effect the changes that made in AAD)

Rather than displaying that User X is already logged in, I immediately want to display log in screen to the User to log in.

Case 2: When I change the password of User X in Azure Active Directory, then reopen the app, it is not asking the user to log in with the new password. Again, it is displaying User X is already logged in.

In both the scenarios I want to display the log in screen for the user to log in.

How can I achieve this?