I also created a test portal to use these rules, however when I make the equivalent changes via UI the notifications are not triggered, for example change deal name
You need to make an oauth request into the portal you want to install it with. You will need to grab the client ID and the client secret from your app. Here is the endpoint you need to hit.
https://app.hubspot.com/oauth/authorize
Then on the dashboard you will see the number of installs in your dev portal