Switching between multiple social media accounts for the same platform

I'm trying to connect our Instagram accounts to Constant Contact (CC). I currently have all of our Facebook pages added to CC and when I was going through all of the permission windows to set them up, I opted in for CC to access our two Instagram accounts (which I confirmed are connected to our Facebook business pages). However, when I go to create a social media post in CC, it will only show me profiles and previews for our Facebook pages and when I look at our social media accounts in CC, it says there are 3 active Facebook accounts and 0 active Instagram accounts. So when I clicked "Connect a Profile" for Instagram, I was able to see my Facebook profile image but zero connected Instagram profiles. So I logged out of Facebook and tried again but I keep getting tossed to back to the same Facebook setup windows that I first encountered when I set up the Facebook pages in CC. It wasn't this difficult to set up all our Facebook, Twitter, and Instagram pages . What the h*** am I doing wrong?