Validation failed, despite using RC (17A321) of Xcode 26

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Created 20h

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Just after the event broadcast, checked to see if the RC of Xcode 26 was ready for download. It was, so I downloaded it, downloaded all of the relevant platform support, made sure to Clean Build folder, checked that I had no issues with my project, then updated build numbers appropriately and ran an Archive. Upon attempting to submit, get this error:

Unsupported SDK or Xcode version. Your app was built with an SDK or version of Xcode that isn’t supported. Although you can use beta versions of SDKs and Xcode to build and upload apps to App Store Connect, you need to use the latest Release Candidates (RC) for SDKs and Xcode to submit the app. For details on currently supported SDKs and versions of Xcode, visit: https://developer.apple.com/news/releases. (ID: 56cbe718-2d73-41d0-8783-f554f8277b61)

What things should I be checking on my end to make sure I didn't miss something?

For reference, here are screenshots of the supported releases, and "About Xcode":

Screenshot 2025-09-09 at 12.58.57_blur.png

Screenshot 2025-09-09 at 13.29.50.png

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Answer 1

Claude31 OP

20h

My guess is that you have to wait for a few hours until everything is in place. Ink is not dried yet.

Message states:

So maybe there is an RC2 already in the pipe (that happens sometimes, like 16.3 and thus this RC1 is no more the latest ?

1

Answer 2

JoshFenton OP

19h

I’m having the same issue. The good news is that I don’t think it’s on our end. The bad news is that there doesn’t seem to be a way to prove that definitively, as I don’t think Apple has told us.

0