Authorization failed: Error Domain=AKAuthenticationError Code=-7026 "(null)" UserInfo={AKClientBundleID=my bundile id}
I have the same issue. I enabled the sign in with apple capability both developer console as well in Xcode, but the error still remains.
I had the same issue just now after I changed by bundle id and developer account. All the settings were correct in my developer account and on Xcode. This fixed it for me: