onSaveInstanceState doesn't handle the state

I'm trying to get my edittext1.text while clicking on the getName button after screen flipped but it doesn't work. How it should work

1. adding some text to the et1
2. click setName then tv1 appears (tv1.text = et1.text, var "name" = tv1.text)
3. flip the screen
4. click getName (at the et1 have to be value "name" that we put to the SaveInstanceState before)

I'm a noobie, hope You can help me! Thanks in advance. <3

class MainActivity : AppCompatActivity() {
    private var name: String? = null

    lateinit var binding: ActivityMainBinding

        override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater).also { setContentView(it.root) }

            binding.setButton.setOnClickListener { setName() }
            binding.getButton.setOnClickListener { getName() }


        }


        fun getName(){
            binding.et1.setText(name)
        }

        fun setName(){
            binding.tv1.text = binding.et1.text
            name = binding.tv1.text.toString()
        }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)

            name = savedInstanceState.getString(KEY_NAME, "unknown")
    }

    override fun onSaveInstanceState(outState: Bundle, outPersistentState: PersistableBundle) {
        super.onSaveInstanceState(outState, outPersistentState)
        outState.putString(KEY_NAME, name)
    }

    companion object{
        private val KEY_NAME = "NAME"
    }

You need to use another overload of the onSaveInstanceState function: the one with with just one parameter: fun onSaveInstanceState(outState: Bundle)

Your code should look the following:

override fun onSaveInstanceState(outState: Bundle) {
    super.onSaveInstanceState(outState)
    outState.putString(KEY_NAME, name)
}