If you have more than one account and so far have been accessing them on different phones to use both accounts simultaneously, you can breathe easy. The official app does the job just fine. Here's what you need to do.
How to add additional Multiple accounts
We're going to assume that you have the official Parallel Space-Multi Accounts app on your smartphone. and one of official Facebook, Whatsapp or Instagram app's signed in with one of your accounts. The steps below will help you sign in with all of your accounts.
1) Install the Application from Google Play Store or Iphone Store.
2) After Opening The Application and you find some recommendation from app.
3) Tap on Setting And Enable Auto Creates Shortcuts for apps.
4) After enabling go back and add Duplicate Shortcuts Application from List.
You can follow the same steps to add more accounts if you have more than two or more account just follow the instructions. Don't worry about Data Mixed Problem Parallel Space create a separate space in your Android phone. In this space, you can run apps independently, in order to login the 2nd account simultaneously. So Don't worry and enjoy Multiple Accounts in Single Mobile phone.