I am facing the same issue while encoding he email like this let customAllowedSet = NSCharacterSet(charactersIn: "=\"#%/<>?@\\^`{|}+").inverted email.addingPercentEncoding(withAllowedCharacters: customAllowedSet) when I try example@something.com it returns this way iOS 17: example%2540something.com iOS 16: example%40something.com Any quick solutions for this issue?