If you encounter the following notification when trying to post on your Facebook page or Instagram account, there can be various reasons:
“We don't have the permission to publish your post. Please check your authorization.”
Please check the settings in your Facebook Business Manager and make sure you have the necessary rights to publish on Facebook / Instagram.
1) Please click on "Settings" in your Business Manager.
2) Afterwards, please click on "More Business Settings".
3) Check the rights of "People" and "Pages".
Please click on "Users" -> "People" and on "Accounts" -> "Pages" as shown in the screenshots below to check if you have the necessary rights to publish content.