Trouble activating the latest Casino DLC – any fixes?

Hey, sounds like a typical failed DLC install. First, confirm that you’re using the correct platform (PS4/PS5, Xbox, PC) version of the DLC. Second, just delete the game cache, and for PC players, update Steam and verify game files. On consoles, run the main game, let it load fully without starting a new campaign, and then try installing the DLC. Third, ensure that you are on the correct patch version before installing the DLC and look for any outstanding system updates. Lastly, if these steps don’t help, contact customer service with the error code.

I'd try checking the game files via your launcher's (Steam, Epic, etc) repair tool. Sometimes mods or exploits might screw with the DLC detection. See the wiki for the proper patch version, and reinstall it if necessary. Make sure you're using the correct version of the game too. It might also be a corrupted download, so retrying the download or switching connections could help. Hop over here if none of these solutions work.