Suddenly getting this error after making minor (storyboard) updates to app, when trying to upload to App Store connect.
App uses Firebase and RealmSwift API's, so I assume one of them is referencing the API in question. However, I have not updated either framework for months, and previous build was accepted and approved by apple.
Searching forums, it appears similar problems were occurring for developers about 3 moths ago. Apple declared it a problem with backend and "fixed." Appears to possibly not be fixed any more...