<PackageReference Include="Microsoft.Identity.Client" Version="4.91.0" />

Microsoft.Identity.Client.TokenCacheCallback

public sealed delegate TokenCacheCallback : MulticastDelegate
Notification for certain token cache interactions during token acquisition. This delegate is used in particular to provide a custom token cache serialization. See https://aka.ms/aka.ms/msal-net-token-cache-serialization
namespace Microsoft.Identity.Client { public delegate void TokenCacheCallback (TokenCacheNotificationArgs args); }