Cannot launch to Oculus Go from Unreal Editor

I'm working on getting a test project launched to the Oculus Go from Unreal, and hitting a snag. Here's what I've done so far:

• Grabbed the ADB driver for the Oculus Go from here: https://developer.oculus.com/documentation/mobilesdk/latest/concepts/mobile-device-setup-go/
• Installed the ADB driver and put the Go into developer mode.
• Installed Android Codeworks from UE_4.19\Engine\Extras\AndroidWorks\Win64 and restarted
• Verified that the Go appears as expected when calling adb devices from the command line.
• Generated a signature file by following the directions here (https://dashboard.oculus.com/tools/osig-generator/) and placed it in UE_4.19\Engine\Build\Android\Java\assets
• Set up a test project following the directions here: https://docs.unrealengine.com/en-US/Platforms/GearVR/QuickStart

The Go appears in Unreal Editor's Device Manager, but isn't present in my Launch menu. What additional thing do I need to do or change?

Thanks!