It sounds like you're having trouble linking your business account for Instagram on WordPress. The issue with the redirect to Facebook might be due to settings or permissions. Here are a few steps you can try to resolve it:
Make sure your Instagram account is set up as a business account.
Check the permissions you've granted to the Instagram account in Facebook settings.
Try disconnecting and reconnecting the Instagram account from the WordPress dashboard.
Ensure that your WordPress and Instagram accounts are both updated to the latest versions.
If these steps don't work, you might want to reach out to Instagram or Facebook support for further assistance. Also, here's a link to a helpful resource:
https://planfix.com/. Let us know if you need more help!