I've been at this for hours, searching all over, trying to find a solution. I've created a very simple app, basically 1 window that has a label saying "Hello World". 'm trying to sign this app with a Provisioning Profile that was created like so: Created "Mac App Distribution" and "Mac Installer Distribution" certificates. Installed them, they show as valid "3rd Party Mac Developer..." in Keychain Access. Created an Identifier for an "app", gave a Description and Bundle ID Created a Profile for a "Mac App Store" type Distribution, used my ID from step 2, chose the "Mac App Distribution" certificate (there was only one), inputted a profile name Then, over to xcode. In Signing & Capabilities uncheck "Automatically manage signing", enter the Bundle Identifier as it was made in step 2 above, import profile as was created in step 3 above. All seems well, however when I press that play button in order to compile and run, I immediately get a "quit unexpectedly" with the following in the details: Exception Type: EXC_CRASH (SIGKILL (Code Signature Invalid)) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: CODESIGNING 1 Taskgated Invalid Signature I can create a "Developer ID Application" no problem, but all goes awry when trying to build in order to make it to the Apple Store. I'm on 16-inch 2019 MacBook Pro, Sonoma 14.1.1, xcode 15.0.1. Is there something super lame I've looked over?