Board Thread:News and Announcements/@comment-24264457-20180925194341/@comment-26573805-20181216224145

Yeah, apparently if you go to the shop, it won't work since it can't connect to Ubisoft's servers and it'll display that you're offline and won't let you download DLCs, even though they're stored on Nintendo/Microsoft/Sony's servers. For whatever reason, it appears you can still unlock monthly mashups, stream Community Remixes, occasionally connect to the World Dance Floor, and access the in-game shop on the Wii.

You can still download the DLCs from the Xbox Marketplace website, the Nintendo eShop on the Wii U, etc. Save yourselves all the trouble and use that for your DLC downloads instead now that you're unable to access the shop in-game.