Prerequisites

1. Make sure you have an Instagram Business account. This link below would help to set up a business account. See https://help.instagram.com/502981923235522.
2. You need to allow your Instagram to send messages via apps, see here https://www.facebook.com/help/instagram/791161338412168 
3. Make sure your Facebook page is connected to the Instagram Professional account, for which the Instagram account holder is admin.

You can do that setting here:

• Go to https://www.facebook.com/pages/?category=your_pages
• Select Your Page
• Go to Settings
• Select Instagram and connect your business account like below:

Setup Instagram Messenger 

Step 1. Click on "Add Inbox" button from Settings > Inboxes page.

Step 2. Click on the "Messenger" icon.

Step 3. Click on the Facebook login button. It will open a new window for you to log in.

Step 4. Authenticate with Facebook, select an Instagram account and select the page you want to connect. Enable all permissions shown in the list. Otherwise, the app might not work.

If you have previously connected your OMNI to your FB Messenger page, you can override it and use this inbox as combined Facebook and Instagram Messenger inbox. You can also deselect the pages you do not want to be part of OMNI. In this example we combine it. We recommend to combine your FB pages with IG account.

Step 5. "Add agents" to your FB/IG Messenger inbox.

Step 6. Hooray! You have successfully created a Messenger/IG inbox. Whenever a customer sends a message to your Instagram account or Facebook page, you will see it in the dashboard.

Step 7. If you want to update the agents who have access to the inbox, you can go to Settings > Inboxes.