I’m running low on ideas. I found a couple of posts on Slackers with the same issue but no solutions posted. My first thought is that maybe there’s a typo or something in the DefaultEngine.ini at project level since you mentioned changing that. If it was me I would probably uninstall all versions of UE5 and then install the latest one again, then before making any changes open a new project and see if the Android Platform settings are there.