[EC2 AMI] Edge is broken on Windows (wptagent) EC2 AMI

[thedoc31]

On the EC2 WPTAgent AMI, Microsoft Edge testing is not working properly. Edge is detected by the startup script [1], but if you attempt to run a check using Edge it throws an error [2] and fails the check with "The testing completed but failed."

@pmeenan let me know via DM if you need an assist on the EC2 AMI - I'm happy to contribute.

[1]
22:40:24.502 - Detected Browsers:
22:40:24.502 - Chrome: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
22:40:24.502 - Edge: C:\WebPageTest\wptagent\internal\support\edge\14\MicrosoftWebDriver.exe
22:40:24.502 - ie: C:\Program Files (x86)\Internet Explorer\iexplore.exe
22:40:24.516 - Microsoft Edge: C:\WebPageTest\wptagent\internal\support\edge\14\MicrosoftWebDriver.exe

[2]
22:47:28.289 - [{'record': True, 'command': 'navigate', 'target': u'http://<internalURL>'}]
22:47:28.289 - taskkill /F /T /IM MicrosoftEdge.exe
22:47:28.461 - taskkill /F /T /IM MicrosoftEdgeCP.exe
22:47:28.571 - taskkill /F /T /IM plugin-container.exe
22:47:28.680 - taskkill /F /T /IM browser_broker.exe
22:47:28.789 - taskkill /F /T /IM smartscreen.exe
22:47:28.898 - taskkill /F /T /IM dllhost.exe
22:47:29.023 - Terminating all instances of WerFault.exe
ERROR: The process "WerFault.exe" not found.
22:47:29.134 - Preparing browser
22:47:29.134 - Terminating all instances of MicrosoftWebDriver.exe
ERROR: The process "MicrosoftWebDriver.exe" not found.
22:47:29.226 - Flushing DNS
22:47:29.243 - ipconfig /flushdns
22:47:29.289 - Clearing profile C:\WebPageTest\wptagent\work\EC2AMAZ-CO5OM1I\browser.180507_PR_E.1
22:47:29.289 - Launching browser : C:\WebPageTest\wptagent\internal\support\edge\14\MicrosoftWebDriver.exe
22:47:29.289 - reg IMPORT "C:\WebPageTest\wptagent\internal\support\edge\keys.reg"
22:47:29.882 - POST http://localhost:51128/session {"capabilities": {"alwaysMatch": {"browserName": "MicrosoftEdge", "platformName": "windows"}, "firstMatch": [{}]}, "desiredCapabilities": {"platform": "WINDOWS", "browserName": "MicrosoftEdge", "version": "", "extensionPaths": ["C:\\Users\\Administrator\\AppData\\Local\\Packages\\Microsoft.MicrosoftEdge_8wek​yb3d8bbwe\\LocalState\\wptagent"]}}
22:47:29.882 - Finished Request Unknown error
22:47:32.898 - Stopping the browser...
22:47:32.898 - Stopping browser
22:47:33.289 - taskkill /F /T /IM MicrosoftEdge.exe
22:47:33.382 - taskkill /F /T /IM MicrosoftEdgeCP.exe
22:47:33.507 - taskkill /F /T /IM plugin-container.exe
22:47:33.618 - taskkill /F /T /IM browser_broker.exe
22:47:33.726 - taskkill /F /T /IM smartscreen.exe
22:47:33.835 - taskkill /F /T /IM dllhost.exe
22:47:33.960 - Test run time: 5.672 sec
22:47:33.960 - Uploading result
22:47:33.960 - Uploading result zip