Test SmartApp: Network connection error when trying to add on iOS

I have followed the steps on GitHub - SmartThingsCommunity/smartapp-example-no-devices-nodejs-lambda: Give Lambda SmartApps a try without any physical devices. to create my first smart app.

I have deployed to AWS, registered successfully and I can see the App in my routine → discover list.

However when I click on it I get a network error.

I use AdGuard DNS and disabled that and even disconnected from Wi-Fi and still receive the same error.

Any ideas?

Figured this out.

I had to toggle off/on developer mode and restart the app.