Extra deck will not work in duels

When I’m playing bots and go to special summon anything, it’ll give me the prompt to use materials, it’ll just go away like I canceled it.
Any advice is helpful, I recently came from Dueling nexus.

A tad delayed, but if this hasn’t be resolved:

Try playing using the Online game mode. The local mode and test hands generally are behind on updates as it requires the team to force every user to download a pretty hefty update in order to fix. The Online core will always have the latest updates as we only have to make the change on the server itself, which we can more easily do.