moved from origin to ea and now cannot access custom

@Hayleigh-mae07 Your game folder won't have moved just from the launcher change. Here's a post on how to locate where it is: https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/  You might also want this info for Mac users: https://bluebellflora.com/2021/10/17/using-terminal-to-locate-your-sims-4-files-and-folders/

When you start the game and check Options, do you have CC checked on?