Community ManagerFollowing up to let the community know how I solved this (EA Help was useless). Of course I can't say if this solution will work for others...
TL:DR: Found the EA DLC files in my Windows OS and manually combined them with my Steam DLCs folder (where the base game lives). Game recognized all at launch, no glitches.
EA DLC folders were moved from these two locations:
To these two respective Steam locations:
TO RECAP: I play Sims 4 via Steam on Win 11 almost daily (since 2020). The first dozen DLCs were purchased via EA Origins, everything else and the base game is purchased via Steam. One day (after playing with no problems every day prior) Origins didn't auto login at launch and the game wouldn't load via Steam (see my earlier posts for details). I did all the obvious troubleshooting, removed mods, checked file integrity...Solve 1: I realized the EA desktop app (formerly Origins) had removed itself from my computer (?!). I downloaded the latest and that solved the game not loading via Steam however the EA DLCs weren't recognized by the game. Reinstalled and did all the obvious troubleshooting via EA, confirmed the correct EA account was connected to Steam, etc etc. Tried adding non-Steam games to my Steam library via Steam Settings / Library and learned I needed keys which the Origin DLCs never provided (I have the original purchase emails). That's when I reached out to EA Helpless 😞 asking for the keys. This proved to be a futile exercise in repeating myself to useless Ai operators. In this process, Solve 2: I realized my DLCs were installing in two different OS directories (one for EA, one for Steam). I located where the EA DLCs were saved in my OS and where the Steam DLCs were saved. Manually combined them and viola! Game loads fine.Maybe this will help you. Maybe this is obvious.Good Luck Frens!
