Get file from Onedrive to android

[hw700]

Using Xamarin on Android: to authenticate on OneDrive I used
authResult = await App.PCA.AcquireTokenInteractive(App.Scopes).WithParentActivityOrWindow(App.ParentWindow).ExecuteAsync();
After converting my app to Maui this did no longer work, because App.ParentWindow was null.
Nothing I tried helped me to get a file from OneDrive to my Android app.
Does an example exist which show how to get a file from OneDrive to Android?