I have had a password autofill app extension in production for years. It still works fine. Except when the user taps a username or password textfield and selects "AutoFill" from the context menu. They are shown a modal error dialog, stating:
"AutoFill Unavailable - The developer needs to update it to work with this feature."
I cannot find any help on this issue. The AutoFill extension works fine when tapping the "Passwords" bar above the iOS keyboard.
Any pointers would be appreciated.