Do not submit apps built using beta software, as beta versions of Xcode, Operating Systems, and SDKs are for development and testing only.
If you received an error message saying, "Xcode could not find a valid private-key/certificate pair for this profile in your keychain." This error message indicates that the Keychain Access application on your Mac is missing either the public or private key for the certificate you are using to sign your app.
It can also happen if your certificate has expired or has been revoked.
Long story short: We have a fix in place and will release our 6.0.1. S.: Join our Ti Slack Community for immediate updates from our engineers.
GA version this Wednesday, along with 18 other bugfixes (Changelog – Log in to JIRA before).
And with support for Swift packages, Swift UI is an innovative, exceptionally simple way to build user interfaces across all Apple platforms with the power of Swift.
Build user interfaces for any Apple device using just one set of tools and APIs.