private IEnumerable <Guid> GetPotentiallyDormantUsers()
{
var configuration = _configurationService.Get <HousekeepingConfiguration>();
var lastValidLoginHours = configuration.DormantAccountStrategy.SendReminderAfterCycles *
configuration.HousekeepingCycleInHours;
var lastValidLogin = DateTime.UtcNow.AddHours(-lastValidLoginHours);
return(_userReadRepository.GetPotentiallyDormantUsers(lastValidLogin));
}