I am having this same problem. My app builds and runs on a real watch but the hours later it reverts to an old build. I’m running watchOS 11.3, Xcode 16.2. is anyone aware of what’s causing the issue? Thanks.

Happy to share it with you privately. Thank you.

Thank you for your help. I have updated the Archive settings to Release and am still getting the same error.

Hi Ed, Thanks for your help. I've changed the build configuration from Debug to Release and the normal Build command works fine. I don't have any compiler macros in the source code. Straker