The Live Activity does launch and when pressed takes user back into the correct app.

Thanks for the reply! Just to clarify, even though the main app is built with Flutter, the Live Activity and widget extension are fully native Swift/SwiftUI and built in Xcode. The issue seems to be on the ActivityKit/WidgetKit side rather than the Flutter side. I’ve gone through Apple’s Live Activity tutorial and everything works except the actual UI rendering (Dynamic Island shows a black capsule even though the regions contain simple Text/Image views with no errors). I’m mainly hoping someone who’s run into a similar ActivityKit rendering issue can point out anything I may be missing in the widget extension setup. Any insights are appreciated!