I am having the same issue and this is not a matter of a simple typo. The b is lowercase. I have working code using AuthDataResultCallback in an older app, but Xcode Version 14.0 beta 3 gives me the error "Cannot find type 'AuthDataResultCallback' in stop" no matter what import for firebase I add. The only difference I can think of is my old app uses Cocoapods to import Firebase, while my current app uses swift package manager. Anyone have the same issue and some luck resolving?