Some users can’t see any available Facebook pages and Instagram accounts for connection and/or Refresh Permissions for the connected accounts.

Please check the following link for more information from Meta Support Team:
https://developers.facebook.com/support/bugs/994034301555870

The link above is a bug report where you will be able to track the progress on this issue's resolution if you subscribe to it. Once they mark it as resolved – please check if it resolves on your end as well, and if it is not – do not hesitate to reply to that bug report.

We will update this incident with further information