I believe it might be possible if you create a whole new app listing. You can use the same name, but you'll need a different bundle url. Let's say you have an unlisted app with the name "My App" and bundle url "com.my.app". You should be able to create a listed version of the by following these steps: 1) Change the name of the old, unlisted app. For example, "My App Unlisted". 2) Create a new app in the app store, with the desired name and a different bundle url. eg name: My App, bundle url: com.my.app.listed. 3) Submit new app for review. 4) Once the review has passed and the new app is live, delete the old app. I haven't tried this so I can't say for sure that it would work. But even if it does work, it's quite a hassle.
Topic:
App Store Distribution & Marketing
SubTopic:
General
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