There was a bug with using release builds with cocoapods, but AFAIK, that should be fixed and published. Cocoapods is a huge PITA for CI, and not that many people are using it now, so the KMMBridge config for it rarely gets run or troubleshot. Cocoapods specifically won't publish unless it can build successfully, which means the 15 things you need to do need to be done exactly correct. The only reasonable way to debug that is to try to publish from you local machine with that release URL, then if that works, try to debug why CI is failing.