Currently, Facebook does not support connecting an Instagram account with two-factor authentication enabled to a Facebook page.
This is internal to Facebook, and will hopefully be addressed by Facebook as they continue to integrate Instagram into the Facebook ecosystem.
The SocialCert process requires connecting your Instagram account to your Facebook page so that your approved partners can amplify your Instagram content to reach a larger audience and measure results.
SocialCert provides a secure way to collaborate with brand partners and only interacts directly with the Facebook API via HTTPS communication.
In order to connect your Instagram to your Facebook Page, you must temporarily turn off two-factor authentication.
[IMPORTANT] You only need to disable two-factor authentication for less than a minute while you link your Instagram account to your Facebook page.
We recommend you turn two-factor authentication back on after you’ve linked your Instagram account to your Facebook page.