Plex Android TV app not connecting to server

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I’ve just set up a new Plex account. Have it activated on my computer and it is showing all of my media, movies and TV series. But when I log in to Plex with the same details on the Android TV Plex app, it shows the media server but it has a little explanation mark in a triangle. When I click on it it does nothing. Both the TV and the computer are on the same Wi-Fi. Can anybody please help?