Trouble Adding a Facebook Page to Later

To add a Facebook Business Page to Later, you must be an Admin of that page. To determine your access level, follow the steps in See your Facebook Page role or access.
You won’t be able to add a Facebook Page if you don’t grant Later all the necessary permissions
Please note that personal Facebook profiles, including those in professional mode, are not supported in Later due to limitations set by Facebook

Remove Later from Your Facebook Apps

Log in to the Facebook profile that’s an Admin of your Facebook Page
- Ensure you're logged into the Facebook profile and not acting as the Page itself
Click on your profile picture at the top left of the page
Click Settings & privacy > Settings
Click Security and login > Business Integrations
Next to Later, click Remove
Do not check off the box to delete posts, videos, or events posted by Later on your timeline
Click Remove to confirm

Make sure you’re logged into the Facebook profile that’s an Admin for the Facebook Page you want to add.
In Later on the web, click the + symbol to add a Facebook profile.
Click Continue as.
When prompted to give Facebook access to Later, click Choose What You Allow.
Expand all sections and make sure all permissions have been granted. Do not uncheck any permissions.
Select the Facebook Page you want to add to Later.