There are some changes in app launch behavior with "prewarm", which can lead to problems with keychain. Check this article and documentation: https://sourcediving.com/solving-mysterious-logout-issues-on-ios-15-8b818c089466 https://developer.apple.com/documentation/uikit/app_and_environment/responding_to_the_launch_of_your_app/about_the_app_launch_sequence#3894431

You need to add post-archive action and share artifacts with internal/external testing group. https://www.kodeco.com/36548823-getting-started-with-xcode-cloud#toc-anchor-008