you must make sure that you've linked an existing or a new Facebook page that belongs to your Facebook profile, you will know you succeeded when on your Instagram's edit profile tab, you will see next to "page" the name of the Facebook page rather then "Connect or Create".
if you can't link a Facebook page for any other reason,
Sometimes it’s easier to complete the linking phase from Facebook’s side and not Instagram’s side this way:
https://www.youtube.com/shorts/CaPy0v81WK0
in case you do not have a Facebook page, here is how you create a new one:
https://www.youtube.com/shorts/Do2u12CeFhM
https://www.youtube.com/shorts/CaPy0v81WK0
in case you do not have a Facebook page, here is how you create a new one:
https://www.youtube.com/shorts/Do2u12CeFhM