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I am on a fresh install of Xcode 15.3 on macOS 14.4 (23E214). I created an iMessage App template and signed it with my personal team's certificate. When I click the run button, it successfully builds and opens the simulator to the Messages app but does not open the compact extension view (or install the extension such that it shows up in the More messages extension list). This reproduces on my older laptop (same version of Xcode) as well as my friend's (also same version of Xcode). Of note: The IceCreamBuilder app installs and runs correctly with no modifications I have not provided any icons for the messages extension The iMessage App template comes with an empty main app that does not install on the home screen The only console output that seems to differ from when I run the IceCreamBuilder is this message, which appears after a couple seconds of running the project: unhandled process MobileSMS Type: Error | Timestamp: 2024-03-09 00:41:07.763631-05:00 | Process: MobileSMS | Library: CoreParsec | Subsystem: com.apple.parsec | Category: CoreParsec | TID: 0xff097