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Thank you very much for your kind and detailed guidance.
 As you suggested, I created a new test project in Xcode using the iOS > App template, enabled automatic signing in Signing & Capabilities, and selected my team.
 I then tried building and installing the app on a real device, and it worked successfully.
 This confirms that there are no issues with code signing or provisioning on the Apple side.
 Thank you once again for your continued support!