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I just got around to updating and Publie Beta 4 is working as well.
I have just checked, El Capitan Public Beta 3, Parallels 10.2.2, Windows 10 Insider Preview with all updates. Controller still gives Code 10 error...
I think we hit upon a common failure point. My laptop used to work with the Xbox One controller before El Capitan. It now fails with an error 10...
I have not tried with El Capitan yet. I have been using latest Parallels 10 update, Windows Insider June through the latest build 10240, on...
You could try installing drivers just in case they weren't already the version of Windows 10 you're using. I switched to the June Windows Insider...
Just make sure the controller is plugged in and set it to connect to your Windows 10 install in the USB Connection Preferences or the Devices...