So this has what worked for me:
Preface:
4 days of debugging, recreated certificates numerous times, nothing worked, every time i try to validate/upload via Xcode it says same error "iTunes software service authentication error domain error 434"
Solution without XCode:
- Create archive in Xcode
- Export IPA in Organiser (Xcode > window > Organiser)
- Open Application Loader and manually choose IPA generated
- Done
Solution with XCode:
- Create archive in Xcode
- Click Validate
- Unselect BitCode
- Check if its validated, mine got validated when i unchecked bitcode
- Not Try to genrate similar fashion with Bitcode unselected
- If all goes fine now generate with Bitcode Checked(mine worked with these exact steps)
- Done
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