NOTE: Make sure that you are connected to your home WiFi.
This article will show you how to locate the HomeKit code of your Wemo Mini on the Wemo app. In the images below, the device's name has been changed to Kitchen Light.
Step 1: Launch the Wemo
app, enter your credentials, then tap on Log In.

Step 2: Tap on the More tab.

Step 3: Select Settings & About.

Step 4: Choose Hardware Info.

Step 5: Tap on the Wemo Mini.

Step 6: Write down the code from the HomeKit Setup Code section.

You can now proceed with adding the Wemo Mini to the Apple Home app. To learn more, click here.