It's important to understand that both the Facebook page and the professional Instagram account are linked to the same personal Facebook account. That's why when you first log in to Instagram or Facebook, it asks you to connect your personal Facebook account.
Facebook Issues
If you are not the owner of the Facebook page, make sure to have the correct level of permission to manage the Facebook page:
Here is an article that may help you to grant the correct permission:
If you have the correct level of permission, then I would recommend you delete the Followr integration from Facebook and start the process again. Sometimes the integration may fail and needs to be restarted.
Here is an article that can help you with that process:
Instagram Issues
First, make sure you don't have any issues with your Facebook page access level. If you can connect your Facebook page to Followr that means that you have the correct level of permission.
Meta requires all Instagram accounts for the following two things:
It should be a Business/professional account
The business account must be connected to a Facebook page.
Here are some articles that might help you with the connection:
Your Instagram account still doesn't appear on the list of options.
I would recommend you delete the Followr integration from Facebook itself. Sometimes the integration may fail and needs to be restarted.
Here is an article that can help you with that process:
Hopefully, that resolves all the issues you're facing! 💪