Synthetic transactions fail after installing February 2017 update for Skype for Business Server 2015

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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