If the device you want to register is an Apple Watch, you’ll need to install Xcode from the Mac App Store as well. [1] X Research source There’s no Xcode for Windows, so make sure you’re using a Mac.

If you installed Xcode to find the UDID for an Apple Watch, open it now, click the Window menu, and then select Devices.

If you’re using Xcode, highlight the UDID with your mouse before copying it.

If you’re using Xcode, highlight the UDID with your mouse before copying it.

If you’re using Xcode, highlight the UDID with your mouse before copying it.

You will need an Apple Developer subscription to add a new device. If you don’t have one, you’ll need to purchase one before you can use the Developer site.