Integration Airtable to Facebook

Hello! I am trying to automate our content planner on Airtable to post on our Facebook page.
All steps work fine except the “Facebook pages: create a new post” part which shows the tests fail --> see screenshot Fail Airtable automation

I followed all the steps advised in this article: https://blog.airtable.com/automation-recipe-publishing-twitter/

I linked the message to the “caption” (long text) part of our table to “message” and the “asset” (attachment) in our table to "attachments. --> see screenshot

Can anyone tell what is wrong?
Thank you in advance!