An unhandled exception was encountered in Conferencing Announcement Service.
In a Skype for Business Server 2019 environment, I see this error on the Front-End servers Log Name: Lync Server Source: LS Conferencing Announcement Service Date: 31-03-2020 14:07:43 Event ID: 33126 Task Category: LS Conferencing Announcement Service Level: Error Keywords: Classic User: N/A Computer: sfb01.contoso.local Description: An unhandled exception was encountered in Conferencing Announcement Service. Exception: System.ArgumentOutOfRangeException: Time-out interval must be less than 2^32-2. Parameter name: dueTm at System.Threading.Timer..ctor(TimerCallback callback, Object state, TimeSpan dueTime, TimeSpan period) at Microsoft.LiveServer.Cas.CasService.OnTerminationCountdownStatusChangedQueued(Object sender, TerminationCountdownStatusChangedEventArgs eventArgs) at Microsoft.Ucas.App.Common.QueuedEventHandler`1.Execute() at Microsoft.Ucas.App.Common.EngineThread.Execute(WorkItem work) Cause: Internal error in Conferencing Announcement Service. Resolution: Restart the service. If the problem persists contact product support. Users don't report any issues, but has anyone seen this error and know what it means?