Firebase Android Onauthstatechanged Called Twice

Firebase onAuthStateChanged is being called twice upon login

Yes this is normal, onAuthStateChanged will keep triggering. You can prevent from multiple calls with this code:

var authFlag = true;
firebase.auth().onAuthStateChanged((res) => {
    if(res && authFlag) {
        console.log('Firebase - onAuthStateChanged', {res})
        authFlag = false;
        //rest of your code

Why is Firebase Auth Signin and login segue being called twice

As this

Auth.auth().addStateDidChangeListener { auth, user in

triggers when login auth happens and causes a segue from this part

usersReference.observeSingleEvent(of: .value, with: { (snapshot) in
   // Get user value
   let value = snapshot.value as? NSDictionary
   let name = value?["username"] as? String ?? ""
   self.userName = name
   self.performSegue(withIdentifier: "alreadyLoggedIn", sender: nil) 
}) 

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