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":
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect