I created an universal app and upload to appstore. But I got an error "ITunesSoftwareServiceAuthenticationErrorDomain error 434" when I validate this build. My app supports portrait only. I'm not sure it is the reason I can not upload this app successfully.
3 Answers
That's because iPad apps should at least support 2 orientations. You could add Upside Down
(which is just portrait orientation upside down) orientation, and it should get uploaded correctly. I'm not sure why you are receiving the mentioned error though.

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From Technical Q&A QA1689
Which orientations should my iPad application support?
You should always make your application support both variants of an orientation. More specifically, if your application supports portrait, then it should support both UIInterfaceOrientationPortrait and UIInterfaceOrientationPortraitUpsideDown; if your application supports landscape, then it should support both UIInterfaceOrientationLandscapeLeft and UIInterfaceOrientationLandscapeRight.

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This error has nothing to do with your device orientation support.
check these answers,

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