FormControlName not working with ion-radio

You can use formControlName in <ion-radio-group>

 <ion-list>
  <ion-radio-group formControlName="preferredLanguage">
    <ion-list-header>
      <ion-label>
        Select Language
      </ion-label>
    </ion-list-header>
    <ion-item>
      <ion-label>English</ion-label>
      <ion-radio value="English"></ion-radio>
    </ion-item>
    <ion-item>
      <ion-label>Spanish</ion-label>
      <ion-radio value="Spanish"></ion-radio>
    </ion-item>
  </ion-radio-group>
</ion-list>