MyEvents.cs

public class MyEvents : WsFederationEvents
{
    private readonly IRepository _repository
    
    public MyEvents(IRepository repository)
    {
        _repository=repository;
    }
}

Startup.cs

.AddWsFederation(options =>
           {
               //ADFS
               options.Wtrealm = "https://localhost/example/";
               options.MetadataAddress = "https://adfs.example.be/federationmetadata/2007-06/federationmetadata.xml";
               options.EventsType=typeof(MyEvents);
               options.TokenValidationParameters.ValidAudiences = new string[] { "https://localhost/example/" };
           })