User credentials/data not cleared on signout

[bgore]

We are using the Intune App SDK for Android to integrate Azure sign-in with our app's sign-in.

When the user enters an email address in our app to sign-in, we use the SDK to enroll the user via registerAccountForMAM. During the acquireToken() phase, the user authenticates with Azure by entering their password in a WebView generated by...the SDK?...the Portal? The result is a token, that when passed to our identity broker, allows them to finish logging into our app.

The problem I have is on sign-out. The user's credentials and data are cleared from the app, the account is removed and unregistered using the SDK. And from the detailed logging handler (MAMLogHandler) I have registered, I can see the account get un-enrolled and a wipe triggered by the protection policy. However, when the same user launches the app and enters their email address, there is no WebView screen asking for their password; instead a cached token is returned, allowing sign-in to complete.

I have tried numerous approaches to clear the cache for WebView, but nothing has helped. Any suggestions would be appreciated.

(I am following the documentation from: https://learn.microsoft.com/en-us/mem/intune/developer/app-sdk-android-phase4, and using
the Taskr sample app for Android: https://github.com/msintuneappsdk/Taskr-Sample-Intune-Android-App, for comparison.)