To get this update, install the May 7, 2019, update (KB4464532) for Microsoft 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 EnableContextualMessages and set the value to 1 in the path:
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Office\16.0\Lync
or
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Lync
Alternatively, you can enable this by creating a custom policy entry and add it to the client policy:
$x = New-CsClientPolicyEntry -Name "EnableContextualMessages" -Value "true"
Set-CsClientPolicy -Identity "<ClientPolicyName>" -PolicyEntry @{Add=$x}
