User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-34833607-20201013025105/@comment-24692230-20201013044810

The wiki is importing BackToTopButton (via ImportJS) which doesn't support UCP yet and throws an error, causing everything under it (like DiscussionsActivity) to not run. Once its commented out or removed, the rest of the scripts imported should start working, if theres no more errors and they work on UCP. Notifications for your message wall are in the bell icon next to your avatar at the top right of the screen (where Discussions notifications and etc are as well).