received string from inputfield appearing as null from other scene

hi im really new to c# and unity and was hoping for some assistance

I'm doing small project and most of it is done, except sending the name from input field to a text label on another scene. i can already send string and int to my online scoreboard but im having a bit of trouble trying to convert the input-field to string and send it to another scene.

basically my code still considers it null even though something is received

here is my code for scene 1

     [SerializeField] 
     public  string user;
     public InputField mainInputField;
 
      public void GetInput(string user){
         DontDestroyOnLoad (this);
         mainInputField.text = user;
         DontDestroyOnLoad(transform.gameObject);
 
     }

my code for scene 2 to show within text label

         public Text usermane;
         
         private UIManagerScript manager;
         manager = FindObjectOfType <UIManagerScript>();
         void Start() {
             manager = FindObjectOfType <UIManagerScript>();
         }
         void Update () {
             usermane.text = "Username: "+ manager.mainInputField;
         }