In a Microsoft Skype for Business Server 2015 environment, you run the Test-CsUcwaConference cmdlet to verify that a pair of users can schedule, join, and then conduct an online conference by using the Unified Communications Web API (UCWA). You may find the test fails and the outputs return a "Failed creating application activity" error message. For example:

$cred1 = Get-Credential "CONTOSO\User1"
$cred2 = Get-Credential "CONTOSO\User2"
Test-CsUcwaConference -OrganizerSipAddress -OrganizerCredential $cred1 -ParticipantSipAddress -ParticipantCredential $cred2 -TargetFqdn
Target Fqdn:
Target Uri:
Result: Failure
Latency: 00:00:01.3141048
Error Message : Failed creating application activity.
Inner Exception:One or more errors occurred.
Inner Exception:One or more errors occurred.
Inner Exception:Object reference not set to an instance of an object.

The commands that are shown here test the ability of a pair of users (CONTOSO\User1 and CONTOSO\User2) to participate in a UCWA online conference.


To fix this issue, install the January 2019 cumulative update 6.0.9319.537 for Skype for Business Server 2015, Front End Server and Edge Server.

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