We also have this problem and have investigated the error. Unfortunately, the check of the codesigning version has revealed nothing. All the apps we checked have v=20400 some of them worked others didn't but then we came across an app that worked in one version and not in another. There we took a closer look at the two builds. The version that didn't work was built on a buildserver with mac os catalina. The app that worked was built on a buildserver with mac os big sur 11.4 so far, all the apps we have built on the big sur server have worked and the ones on the catalina server have not...

We are facing the same issue 👀

Awesome, that's it! Thank you so much 🥳 Where did you find the solution/hint/doc? 🤓 That means for our fastlane setup, I just needed to add ARCHS=x86_64 to the xcargs xcodebuild( workspace: 'dummy.xcworkspace', scheme: 'dummy', destination: 'platform=iOS Simulator,name=iPhone 15', buildlog_path: dummy_path, xcargs: '-quiet ARCHS=x86_64' ) *the -quiet is not part of the solution *