[Bug] PlatformNotSupportedException in macOS App

Which Version of MSAL are you using ? MSAL 4.23.0 MSAL Extensions 2.16.5

Platform Xamarin.macOS

Is this a new or existing app? a. The app is in production, and I have upgraded to a new version of MSAL

Repro

var storageProperties = new StorageCreationPropertiesBuilder("msal_cache.dat", Environment.GetFolderPath(Environment.SpecialFolder.Personal), ClientId)
    .WithMacKeyChain(Foundation.NSBundle.MainBundle.BundleIdentifier, "msal_account")
    .Build();
var cacheHelper = await MsalCacheHelper.CreateAsync(storageProperties).ConfigureAwait(false);
cacheHelper.RegisterCache(pca.UserTokenCache);

Expected behavior After updating MSAL to 4.2.30 I get a PlatformNotSupportedException when trying to add a token cache which is being thrown here: https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/blob/79b57039a076391fe350a736fe9c951322fdd422/src/client/Microsoft.Identity.Client/TokenCache.Notifications.cs#L156-L164

Actual behavior No exception when adding custom token cache

Additional context/ Logs / Screenshots

[bgavrilMS]

Ack, please stay on MSAL 4.22 for now. Will get this shipped in 1-2 weeks.

[ghelyar]

For reference, we’re also using this on Xamarin.Mac in order to use the macOS keychain as the token cache.

Without this, iOS uses the keychain, but macOS does not.