Hello @Arundhati Sen - Thanks for reaching out! I've gone over the steps in the same doc that you referenced above and didn't run into any problems. While I did get an empty list like you upon navigating to the Event Subscription page after creating the Logic App successfully, I hit the refresh button (highlighted in the screenshot below) and was able to see the Logic Apps listed under the Event Subscription page:
Could it have been just a matter of refreshing the page for you too? If you're still blocked with this issue, let me know in the comments below and we'd be happy to help.