So, after a hell of a lot of stuffing around I have finally moved past this error. Not resolved in the sense that I never was able to pinpoint the true cause, but suppressed, stomped on and generally nulled.
I didn’t get any response through his forum, but was able to engage with another UE4 dev who has had similar experiences over on Reddit. Just being able to interact with someone about it got me through in the end.
Final resolution can be attributed to:
- Upgrade Mac to OS X 10.14 & Xcode 10.1
- Format PC and re-install Win 10 (Home), Drivers then UE4.21,4.20,4.18 and dependencies.
- Import Developer mobileprovision and certificate / key (Same ones I exported from Mac Keychain previously)
- Import mobileprovision and cert to project
- Set remote build server and username, create SSH key
- Build
My (purely guesswork) diagnosis: Somewhere among the backend UE4 toolset / certifcates on the PC there was a permission problem or a version conflict. I just couldn’t find it.
My advice? Once you have spent more than a couple of hours tracking down a build error like this - flatten it all a start from a clean slate. Even accounting for re-installation of stuff it is so much faster. And if anyone says “reformatting is not an option”… you sound like you are courting danger in the form of a system drive failure. Live like its about to die and you need to re-install quick and get back to work. I’ve blown about a week on this ■■■■. Lesson learned.