To log in to DisneyPlus on multiple devices using DisneyPlus.com/begin, start by launching the Disney+ app on your device. When prompted, you'll see an 8-digit code on your screen. Open a browser on a separate device, visit disneyplus.com/begin, and log in to your Disney+ account. Enter the code displayed on your device screen, then click "Continue." Once verified, the device will be successfully linked to your account. Repeat this process on each device you want to connect. This method makes it easy to access Disney+ content across all your compatible devices seamlessly.