title: Firebase Auth not working in standalone app
body: <p>I'm using Firebase Auth in my Expo/React Native App. Authentication works perfectly in local, but in production (APK downloaded from Play Store), users can't create their accounts.</p>
  <p>What is most strange, a couple of users were able to create an account after trying again (one user says she closed the app and then tried signing up again with a different email and then it worked for her).</p>
  <p>Here is the code relevant for the sign up:</p>
  <pre><code>handleRegister = async ({ name, email, password }) =&gt; {
      this.setState({ inProgress: true });
      try {
        const credentials = await this.createUser(email, password);
        await this.saveUser(name, email, password, credentials.user.uid);
        this.updateProfile(credentials, name);
        this.setState({ inProgress: false });
      } catch (error) {
        this.setState({ errorMessage: error.message });
      }
    };
  
    createUser = async (email, password) =&gt; {
      return firebase.auth().createUserWithEmailAndPassword(email, password);
    };
  </code></pre>