We’ve encountered a couple of bugs specific to iOS 14 and it would take time to fix them. As the market share of 14 is decreasing and people constantly updating their devices, we decided to spend our time and resources on new features on iOS 15 and not bug-fixing on 14.
If you’re already on iOS 15, there’s absolutely nothing you should do! The app will not change and it will work fine.
If you’re on iOS 14, the app will stop working from Thursday (24.03.2021). However, once you update to iOS 15, you’ll be able to use the app again.