The Under Games campaign not launching

Hey guys, just bought the under games expansion, however I can't get the campaign to start ingame.

Whenever I choose the campaign in singleplayer menu, the camera moves over to the war table, but the textbox below "The Under Games" is empty, instead of showing the available Underlords (as I saw in some videos). Screenshot below.

What makes me curious is, that when I went to the campaign menu when
coming straight out of a game I was able to see the props, like the
little towers on the hexes, still not being able to click something though.