As Apple states:
ITMS-90725: SDK version issue - This app was built with the iOS 17.4 SDK. Starting April 24, 2025, all iOS and iPadOS apps must be built with the iOS 18 SDK or later, included in Xcode 16 or later, in order to be uploaded to App Store Connect or submitted for distribution.
Why FF is still on 14.0.0 ? are we referring to the same minimum version? is not clear tbh