Issues with Running TestExecute in Powershell

I'm trying to run TestExecute using powershell, and it seems to startup, but then it returns to the command input shortly after without running my test suite. I've tried running it on command  line, and it seems to work just fine, so I feel like there is something that is not being transferred correctly in the powershell format: 

 Start-Process -FilePath $testExecutePath -ArgumentList $pjsFilePath, "/run", "/project:$projectName", "/test:$TestGroupName", "/ErrorLog:.\ErrorLog.log", "/SilentMode", "/exit", "/AccessKey:$accessKey" -Wait

I've tried running different versions from related community support posts with not much success.