All Android 9 Pie devices will be able to “Turn on WiFi Automatically” you don’t need to do anything.
The tool itself still behaves in the same way on Pie as it did on Oreo, meaning it also requires you to have “Wi-Fi Scanning” turned on under the “Location” menu of the Settings app. Android 9 Pie is presently only available on Google’s Pixel devices and the Essential PH-1, though it will start hitting a broader range of handsets this fall.
