An unhandled exception was encountered in Conferencing Announcement Service.

[Claus-Ole Olsen]

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?

[#2]

same error here.
SFB 2019 on Win2019.
pls post solution if you find it

[#3]

Same here, also no knowledge of user impact.

[#4]

I have found this error shows when you call a Competella AgentService queue

@Mike Shivtorov
@domienxylos

Do you use Competella in your environment?

[#5]

@Claus-Ole Olsen 

No but we are using Anywhere365. I guess that it has to do with the way those products work. They setup a conference for joining agent and caller. In this process they do a certain action which triggers the event. The issue only happens on a Skype for Business 2019 environment and not on 2015.

We have a confirmation of Anywhere365 that there is no user impact but nevertheless this makes a lot of clutter in the event log.

So seems to be a specific "bug" on SfB2019 ?!

[#6]

@domienxylos 

Competella do the same, setup a conference for queue handling

But your are right, this is only a problem in SfB 2019...

[#7]

Same issue here. 

Just applied March 2020 CU. 

Using Enghouse Interactive. It uses conferences for call control. Alot of these alerts. 

[#8]

Same Issue on our environment. We have implemented Luware Callcenter.