Short version
Is it still possible for one developer to compile an iOS app and pass it to another who has the distribution certificate (and private key) to upload to App Store Connect?
Background
My company has signed a contract for an external developer to deliver an app for us to put into the app stores, without giving us the source code.
We have tried resigning the app by removing the _CodeSignature folder and running 'codesign -f -s ......', but App Store Connect rejects it because of some problem with SwiftSupport folder. So now this external developer is insisting there is no way for him to compile the app and us to distribute it and wants our cert and private key even though Apple says "Do not share Apple Certificates outside of your organization."
Yes it is possible. Check out this tool on github https://github.com/Elyorbe/XReSign