I looked at that, but I don't have a itmstransporter folder. What's frustrating is that the same archive validates with Xcode 26, and Xcode cloud using the latest releases of MacOS and Xcode. That's why I'm not thinking it's the app itself. Thanks though

I haven’t yet. Just heard back from developer support who sent me to ai generated answers, which would be useful if I was using Xcode 15 instead of Xcode 27. i put detailed comments plus logs and diagnostics in the feedback system, but I’m doubtful I’ll hear anything from that.

No, I’ve sent in a ticket to try and get a solution.