https://forums.warframe.com/forum/1885-cross-platform-save-news-updates/
I think when it shows up it will be under your login > account management. I've been checking every few days. tbh though with the free CoD weekend now I'm wondering if I should just play that. I havent played CoD in literally almost 15 years there is so much crap on it now. It is like it's own huge ecosystem.