iTunes 12.6.4 keep asking authorization
On iMac OS X El Capitan, iTunes 12.6.4 ask constantly to authorize my iPhone 6+ (iOS 12) and Mini iPad 3 (iOS 12) for installing new App. When I (re)authorize them, it says those devices was already authorized and they will be reauthorized. But apparently it's not working since iTunes keep to ask to authorize those devices...
iMac (24-inch Early 2009), OS X El Capitan (10.11.6)