Suddenly Don't Own GA
I need to reinstall Spore, I have almost all of the Spore DLCs (I just don't have Bot Parts), yet the stupid EA app says I only have Creepy and Cute!! I already got all of them years ago on Steam and then Origin.
EA removed the ability to see your CD-Key sometime around 2021. Before this time you could distribute your CD-Key for another player to register the game. CD-Keys only tie one account, but still allow you to play the game as normal.
Seeing as you have Galactic Adventures in your purchase history however, I'd contact EA Live Chat again and get in touch with different advisor. Using the method outlined in post #2 on providing proof of purchase history. Sometimes advisors can a little stiff, let them know you'd like to transfer your Steam copy of Galactic Adventures over to the EA App.
From your original post, you said you had it on Origin. Origin was discontinued a while ago and the EA App has taken its place. You're 100% sure you had Galactic Adventures in that account and not another? It could've been removed by EA themselves, if they're saying it's 'unauthorized and illegal'. That's kinda out of any technical knowledge we'd be able to help you with here.
As another check, did you register the copies online and do you have a SPORE account? If so, try logging into the Spore website. (You may need to use a different browser or clear cookies). You'll be looking for these icons I've attached below. It pretty much proves you registered Galactic Adventures.
You can also provide your screen name here if you'd like and I could check for you.