Did you enter the pass nu ber in the app yet? If so, then do you see a validity period if you go to My Pass?

If there's a validity period, then you activated your pass. If the start date you chose is in the future, then you can deactivate it: select a travel day and tap on “Cancel travel day”. Do that for each activated travel day. When you cancel the last travel day, answer "yes” to the question whether you want to deactivate the pass.

Unless you have activated the pass it is deactivated.

Have you looked at the tutorial for how to set up your mobile pass?

https://community.eurail.com/news-and-announcements-39/tutorial-how-to-setup-your-mobile-pass-5147