@Syra22 Do you mean the EA Desktop App? Anything your EA account owns, including Sims 4 packs, is supposed to show up in both Origin and the Desktop App. (The exception is a subscription through Game Pass, which Origin doesn't support.) In practice, the app is still in beta and doesn't have full functionality.
Still, most packs do work for me in the app. Please open it, click Sims 4, click the DLC button, and see whether Eco Lifestyle is listed as owned. If it's not, contact EA customer support to make sure it's still on your account.
https://help.ea.com/en/contact-us/
By the way, if this becomes a headache, or you decide to cancel Game Pass in the future, you may want to buy the Sims 4 base game outright. It's as low as $5 U.S. or the equivalent during Origin's somewhat frequent sales.
