Please keep in mind that you can not claim an Instagram account you do not own. If you are promoting on the behalf of someone else, the owner should initially declare their Instagram account through their own Facebook Organisation Manager.
How To Link Instagram With Facebook
If you own the Instagram account: Merely go to your Facebook Organisation Manager and click settings. Under individuals and Assets tab, click Instagram Accounts on the left then click on Claim Instagram Account button on the right.
Type in your Instagram username and password.
You can likewise decide to link it to your ad account if you have one.
Furthermore you can also appoint partners to manage your Instagram account after you have actually link Facebook Business Manager to your Instagram account.
Back in the ads supervisor page, once you've successfully included the account you'll be able to select your Instagram account at the advertisement development page.
Doing this will enable individuals to click to follow you on Instagram instead of sending them to your Facebook page.
Keep in mind that you can not directly buy followers on Instagram rather than Facebook likes campaign How To Link Instagram With Facebook.