I'd kiss you right now if you're nearupdated
Android emulation like nox, bluestack, etc. are considerer as rooted devices. Probabily fgo changed its rules forced by playstore.Ok, correction. I've found the (admittedly weird) issue. I kept getting a message that said it won't install on a rooted device, but it wasn't rooted. so randomly I try turning rooting on and it installs. who knew?