This guide will walk you through how to fix this error:
FB post fetching error: Invalid OAuth 2.0 Access Token
Include all published posts
For Google Sheets / Microsoft Excel
To begin with, please select "Include all published posts" under Options, from the sidebar:
For Data Studio
Please select "Allow Include all published posts to be modified in your reports" when authenticating the data source, as in the screenshot below:
Please note that if you don't meet those requirements, you won't be able to fetch data from those pages. If you are unable to change your access/permission-level, please contact the administrator of your page(s).
New Page Experience
Facebook launched a new page called New Page Experience which requires new access requirements. For Facebook Insights you must have "partial access". For more information please refer to this guide: New Page Experience
Once you have followed all the steps above, please re-authenticate the data source:
Data Studio: How to re-authenticate a Data Studio connector
Google Sheets: How to re-authenticate a Google Sheets connector
Microsoft Excel: How to re-authenticate an Excel connector
If you continue to have issues after trying the above actions, please submit a request to support with the details of the issue and we will assist you.