To connect your Instagram account to Social Scheduler, there are a few prerequisites you need to meet.
First, your Instagram account must be set up as a Business account and linked to a Facebook Page. You can learn how to convert your Instagram account to a Business account and connect it to a Facebook Page by following the steps provided in this guide: "Converting Your Instagram Account to a Business Account."
Additionally, your Facebook Profile must have Admin access to the Facebook Page linked to your Instagram account. You can refer to Facebook's guide on managing roles for more information on how to set this up.
It's important to note that if you have a Creator account, you won't be able to connect it to Social Scheduler, as Instagram only supports publishing to Business accounts at this time.
Connecting or reconnecting your Instagram business account can be a little challenging due to the complexity of Facebook and Instagram's APIs.