Symptoms

After you install February 2017 update for Skype for Business Server 2015 (build 6.0.9319.277), synthetic transactions don't work as expected. For example, when you run the Test-CsUcwaConference (UcwaConference) cmdlet, you receive the following error message:

Error Message: Failed creating application activity.

Inner Exception: Method not found:

'System.Threading.Tasks.Task`1<Microsoft.Rtc.Internal.Ucwa.ClientModel.Interfaces.IHttpResult>

Microsoft.Rtc.Internal.Ucwa.ClientModel.Interfaces.IMeService.MakeMeAvailableAsync(Microsoft.Rtc.Internal.Ucwa.ClientModel.ApplicationSignInProperties)'.

Resolution

To fix this issue, install the December 2017 cumulative update 6.0.9319.510 for Skype for Business Server 2015 and Unified Communications Managed API 5.0 Runtime.

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