Confirm your Instagram account and Facebook Business Page is linked via Instagram:

  1. Log into your Instagram account (on a mobile device)
  2. Go to Edit Profile 
  3. Select Page
    ig1.
  4.  Tap on the Facebook Business Page. Check if the Business Page is selected
  5. You’ll see “Select a Facebook Page to connect to your Instagram account or create a new one”
    IG2.