Question:
Trying to add two Instagram Business accounts but these are not being added. The Facebook pages associated with the accounts are already added but it is still not working.
Answer:
First, you must enable the connected Facebook page. The way Instagram works is, it's always dependent on it's connected Facebook page. Please refer to the image below:
Next, make sure that you have granted all required permissions for your Instagram business to work.
To add permissions, please go to Import Social Media → Instagram Tab → Add Instagram → Continue with Facebook → Make sure all permissions are checked
You can also watch how to do this on this video → https://fb.watch/7k-3kRU2rr/