In short, you have to change some config in the self-hosted Zulip server, and publish modified versions of the application to the app stores you want to support. This is not a limitation of Zulip, it's the app stores forcing all apps to have their notification sources restricted to a common, known ahead of time, server.
In short, you have to change some config in the self-hosted Zulip server, and publish modified versions of the application to the app stores you want to support. This is not a limitation of Zulip, it's the app stores forcing all apps to have their notification sources restricted to a common, known ahead of time, server.