public async Task <ClaimsIdentity> GenerateUserIdentityAsync(UserManagerToken manager, string authenticationType)
        {
            var userIdentity = await manager.CreateIdentityAsync(this, authenticationType);

            return(userIdentity);
        }
        public async Task <ClaimsIdentity> GenerateUserIdentityAsync(UserManagerToken manager)
        {
            var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ExternalBearer);

            return(userIdentity);
        }