Error occurs when a Persistent Chat Server pool is down even if you're not using that pool in Skype for Business 2016

Applies to: Skype for Business 2016

Symptoms


You receive an error message that states that your connection with the Persistent Chat Server pool is down in Microsoft Skype for Business 2016. This issue occurs even though you're not using that pool.

Resolution


To fix this issue, install the March 5, 2019, update (KB4462190) for Skype for Business 2016.
Note Before you apply this update, make sure that you create a Group Policy Object (GPO) to add a new DWORD registry key EnablePersistentChatPoolDown and set the value to 1 in any one of these registry paths:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Lync
or
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Lync
Alternatively, you can enable this by creating a custom policy entry and add it to the client policy:
$x = New-CsClientPolicyEntry -Name "EnablePersistentChatPoolDown" -Value "true"
Set-CsClientPolicy -Identity "<ClientPolicyName>" -PolicyEntry @{Add=$x}