Using firebase auth, how can I create accounts without login out of the current active one?

In a project I'm working on, we are using firebase auth.

Inside the app, users are able to create accounts for other users. However, we have the problem that, whenever a new account is created, the new user is automatically signed in, so the session is lost, for example:

• Person A creates an account, named A

• A is automatically signed in (this is correct)

• A creates an account for person B, named B

• B is automatically signed in and A is kicked out (this is bad)

I found this answer to the same problem, but after trying the implementation, it still doesnt work (maybe the answer is outdated?). I am using firestore, not realtime, in case it is relevant.

This is my code:

FirebaseAuth mAuth;
FirebaseAuth mAuth2;
FirebaseFirestore firestore;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_account_management);
mAuth = FirebaseAuth.getInstance();
firestore = FirebaseFirestore.getInstance();
buildSecondAuth()
}
/*Builds the auxiliar mAuth in order to create a new user*/
private void buildSecondAuth() {
FirebaseOptions firebaseOptions = new FirebaseOptions.Builder()
.setDatabaseUrl(firestore.getApp().getOptions().getDatabaseUrl())
.setApiKey(firestore.getApp().getOptions().getApiKey())
.setApplicationId(firestore.getApp().getOptions().getProjectId()).build();
try {
FirebaseApp myApp = FirebaseApp.initializeApp(getApplicationContext(), firebaseOptions, mAuth.getApp().getName());
mAuth2 = FirebaseAuth.getInstance(myApp);
} catch (IllegalStateException e)
{
mAuth2 = FirebaseAuth.getInstance(FirebaseApp.getInstance(mAuth.getApp().getName()));
}
}
/*Uses the auxiliar auth to create a new account*/
private void signUpNewUser()
{
mAuthJugador.createUserWithEmailAndPassword(getEmail(), getPass())
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
{
@Override
public void onComplete(@NonNull Task<AuthResult> task)
{
if (task.isSuccessful())
{
mAuth2.signOut();
}
else
{
Log.w("TAG", "createUserWithEmail:failure", task.getException());
}
}
});
}

I think you cannot create 2 instances of authencation for the same firebase app. You can create 2 instances for different firebase app in the same Android app.

For more info. See this previously answered post.