Even if you install a Facebook IPA from 2021 (for iOS 12), many of its internal features rely on Graph API endpoints. Facebook routinely shuts down old API versions. You may find that the app installs, but:
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:If you haven't "purchased" Facebook before, sign in to your Apple ID on a newer device (running iOS 13+) and download Facebook there. This adds the app to your "Purchased" history, allowing you to follow the steps above on your iOS 12 device. Even if you install a Facebook IPA from