VSTest 2015

I'm trying to setup TC 9.1.7 on a server and I'm encountering an issue when trying to add a Testing step.

     Runner Type: Visual Studio Tests

     Test engine type: VSTest

     Test engine version: VSTest 2015

     Test file names: C2.Tests\bin\Debug\C2.Tests.dll

     Target platform: x86

When I added this Step, I was prompted to add a Config parameter:

     Name: teamcity.dotnet.vstest.14.0

     Value: C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe

When I run all my steps I get an error in the Unit Testing step:

[14:23:17][Step 3/3] VSTest report watcher
[14:23:17][VSTest report watcher] No reports found for paths:
[14:23:17][VSTest report watcher] C:\BuildAgent\work\d28aa71801c772cb\TestResults\*.trx
[14:23:17][Step 3/3] Step Unit Testing (Visual Studio Tests) failed

I've had to do several things differently on this setup (on server) then when I was testing locally on my machine.  I'm not sure where to look to correct this issue.  Please advise.