How to update user properties using CSOM

Hello All ,

Is it possible to update a SharePoint user properties (like email, title, etc) using CSOM API? In the User class (Microsoft.SharePoint.Client.User) i saw properties like Email, Title are possible to get and set. I tried updating these properties through code like below, but it is not getting updated in SharePoint. Is there any alternative way?

        String updateUser= "john alex";
            User user1 = web.EnsureUser(updateUser);
            user1.Email = "adc01@example.com";
            clientContext.Load(user1);
            clientContext.ExecuteQuery();
 
Regards

Shahabas