Delete a User - Flutter SDK
Call the App.deleteUser() on a user object to delete the user's account from your App Services App. This deletes the account from the App on the server in addition to clearing local data.
final currentUser = app.currentUser!; await app.deleteUser(currentUser);
The user must sign up for a new account to use your App in the future. Even if the user signs up again with the same credentials, App Services creates a new user account with a new User ID.