I've been trying to solve this problem for days now. Currently I'm saving a user id and device id to keychain so if the user installs the app to another device, he/she can access the data from our backend without any problems.I'm developing on an iPhone, and the second device is an iPad. When I first tested the synced keys, iPad loaded them as expected and everything worked fine. But then, syncing stopped when I started deleting or updating the keys.Currently both devices are not able to get the updates from Apple.I thought this was a framework issure. I was using KeychainSwift because it's apis are simpler. So I changed it to KeychainAccess. With both frameworks the state is the same, no syncing between devices. I returned back to KeychainSwift...I tried disabling/enabling keychain for iCloud on both devices, logging out and in again, resetting and logging in. Nothing seems to work. I am unable to continue to progress on the app.This is how I'm reading/writing with KeychainSwift:static func write (key: SettingKey, value: String, syncronizable: Bool = true) -> Void { let keychain = KeychainSwift() keychain.accessGroup = Settings.accessGroup keychain.synchronizable = syncronizable keychain.set(value, forKey: key.rawValue, withAccess: .accessibleAfterFirstUnlock) if keychain.lastResultCode != noErr { let error = KeychainError(status: keychain.lastResultCode) appSimple(" Keychain error for \"\(key.name())\" -> \(error.description)") } } static func read (key: SettingKey, syncronizable: Bool = true) -> String? { let keychain = KeychainSwift() keychain.accessGroup = Settings.accessGroup keychain.synchronizable = syncronizable let value: String? = keychain.get(key.rawValue) if keychain.lastResultCode != noErr { let error = KeychainError(status: keychain.lastResultCode) appSimple(" Keychain error for \"\(key.name())\" -> \(error.description)") return nil } return value }SettingKey is a string enum.Settings.accessGroup is a static constants defined as string.KeychainError is an OSError enum, containing string descriptions for possible keychain error codes.appLog is a debug printing method of my own.I'm currently stuck with this problem. Any help is appreciated. 😟