Android application doesn't automaticly request for microphone permission


So I’m developing a VR game for Google Cardboard and I ran into the following problem. For my game I need access to phone microphone. It works perfectly fine if I add permission manualy (in phone settings) but it don’t ask for permission automaticly (so if I dont enable it manualy it Android microphone don’t work).

I also added this into Start method:

private IEnumerator Start()
        if(Application.platform == RuntimePlatform.Android ||Application.platform == RuntimePlatform.IPhonePlayer)
            yield return Application.RequestUserAuthorization(UserAuthorization.Microphone);
            if (!Application.HasUserAuthorization(UserAuthorization.Microphone))
                yield break;

but it doesn’t ask for permission when I install or start the app.

Here are some infomations about project:
Android min. API: 19
Android version: 7.0
Unity version: 5.6.1f1

<?xml version="1.0" encoding="utf-8"?>
     Copyright 2014 Google Inc. All rights reserved.

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
<manifest xmlns:android="">
    <application android:icon="@drawable/app_icon"
        <activity android:name=""
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="" />
            <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
        <meta-data android:name="IMMERSIVE_MODE" android:value="true" />
    <!-- Set target sdk version to Lollipop to prevent issues with Marshmallow's runtime permissions. -->
    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="24" />
    <uses-feature android:glEsVersion="0x00020000" />
    <uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true"/>
    <uses-feature android:name="android.hardware.sensor.gyroscope" android:required="true"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-feature android:name="android.hardware.microphone" android:required="true" />
    <uses-permission android:name="android.permission.NFC"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />

    <!-- VR feature tags. -->
    <uses-feature android:name="" android:required="false"/>
    <uses-feature android:name="android.hardware.vr.high_performance" android:required="false"/>

Same issue.