Xcode Archive Fails: "Cannot find file in scope"

Question

I'm working on a macOS SwiftUI app in Xcode and encountering a build failure only when archiving the project. The app builds and runs successfully in Debug and Profiling configurations, but when I try to Archive, it fails with the following errors:

Image of Error

Cannot find type 'AppView' in scope
Cannot find 'Sidebar' in scope
Cannot find 'HomeView' in scope
Cannot find 'MessagesView' in scope
Cannot find 'ChatView' in scope

AppView, Sidebar, HomeView, MessagesView, and ChatView are all in a folder called "Views". They are referenced in the main file, and build successfully when I'm building for debugging or profiling. However, the above errors (Cannot find [HomeView, etc] in scope) only rise when I'm trying to archive the app.

This issue occurs even though: The files exist in the project and are correctly included in Compile Sources under Build Phases. They are checked under Target Membership for the correct target. Defines Module is set to YES for the main app target. The project builds successfully for Debug and Profiling. I have already tried cleaning the build folder, resetting Derived Data, and restarting Xcode.

What I Have Tried:

• Checked Target Membership for all Swift files (they are added to the correct target).
• Ensured Defines Module is set to YES under Build Settings.
• Cleaned the build folder (Shift + Cmd + K), deleted Derived Data, and restarted Xcode.
• Verified that all files are included in "Compile Sources" under Build Phases.
• Ensured No Excluded Architectures in Build Settings.
• Removed SwiftUI PreviewProvider code from all files.
• Checked for any missing dependencies or frameworks.
• Set Build Configuration to Release under Run.
• Attempted defaults delete com.company.app hasOnboarded, but it returned Domain not found.

Question: What else could be causing this error only during Archive? Are there any additional build settings or project configurations that could be interfering? Would really appreciate any guidance!

If this is still not enough information, please let me know what else to add. I've clarified the issue more: an error about scope arises when I'm only trying to archive my app, since it builds successfully in all other modes.