If your followers are unable to enter your Instagram giveaway and see the below error:
{"error_type": "OAuthException", "code": 400, "error_message": "Your facebook account's off-Facebook activty in turned off."}
It means they (or one of the other page admins associated with their profile) has 'off-Facebook Activity' disabled, which prevents other apps like POPSMASH from accessing the data needed to connect to their Instagram account and record their entry.
How to fix the error
Your followers can fix the error by following the steps below:
Log in to your Facebook account and click on the down arrow from the top right of the screen by their profile image.
Select Settings & Privacy and click on the Settings option.
Make sure the Your Facebook Information option in the left sidebar is selected:
Select the Off-Facebook Activity option.
You'll now see a pop-up screen from where you need to select the Manage future activity option.
Now, ensure the Connect future activity is switched on.
Still not working? Here's what to check.
All Facebook profiles that are connected with your Facebook Page(s) have must this settings turned on. So, if your page has multiple admins, then all of them must have this enabled.