React Native Android not forcing portrait mode

I'm trying to force portrait-only on my RN app for Android but no matter what I try, I can't make it work.

Problem is when I set the auto-rotate: ON on my Huawei device, it's a P20 Lite. Seems the 'portrait' isn't overriding the device's sensor. When, according to the docs, that should happen, if you want it to NOT override the sensor, suggests using userPortrait instead. But I need to override and lock my screen to be portrait no matter what.

This is my AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.myapp">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
      android:name=".MainApplication"
      android:label="@string/app_name"
      android:icon="@mipmap/ic_launcher"
      android:allowBackup="false"
      android:usesCleartextTraffic="true"
      android:networkSecurityConfig="@xml/network_security_config"
      android:theme="@style/AppTheme"
      tools:ignore="LockedOrientationActivity" // <---- HERE
      >

      <meta-data android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id"/>

      <service android:name="io.invertase.firebase.messaging.RNFirebaseMessagingService">
        <intent-filter>
          <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
      </service>

      <activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name" />
      <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
      </activity>

      <activity
        android:name=".SlashActivity"
        android:theme="@style/SplashTheme"
        android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
      </activity>

      <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:launchMode="singleTop"
        android:screenOrientation="portrait"   // <---- HERE
        android:configChanges="orientation|keyboard|keyboardHidden|screenSize" // <---- HERE
        android:windowSoftInputMode="adjustResize"
        android:exported="true">
      </activity>
      <activity android:name="com.facebook.react.devsupport.DevSettingsActivity"/>
    </application>
</manifest>

Even tried to set it in the MainActivity.java:

package com.myapp;
import android.content.pm.ActivityInfo;
import android.os.Bundle;

import com.reactnativenavigation.NavigationActivity;
import org.devio.rn.splashscreen.SplashScreen;

public class MainActivity extends NavigationActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        SplashScreen.show(this);

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // <--- HERE
        super.onCreate(savedInstanceState);
    }
}

Any ideas of what could be happening?

Thanks.