<Android - LiveData observe not getting update fro...

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[user]

Android - LiveData observe not getting update from AndroidViewModel in active Activity
I do see quite some questions about this issue but most of them are related to Fragment. I am calling it inside the activity but still not observing any changes.
MainActivity.kt:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

val mainViewModel =
ViewModelProvider(
this,...