To connect an Instagram account to funnel a few criteria has to be met.  

The Instagram account has to be a business account. It also has to be connected to a Facebook page. Once the Instagram business account is connected to a page, any Facebook user who is able to perform tasks on behalf of that page can connect the Instagram business account to Funnel.

An Instagram account can be converted to a business account at any time.

If you have connected with the Media insights report, the media that was posted before it was converted will have zero values for these metrics:

Impressions
Reach
Engagement
Saved
Carousel Album Impressions
Carousel Album Reach
Carousel Album Engagement
Carousel Album Saved


If you have connected with the Account insights report there will only be data from when the account was converted to a business account.

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