Failing to get Access Token

Hi,

The plugin is running for almost a year, and couple of weeks ago we had a trouble syncing images. i tried to get new access token but i get this error from Facebook –
“URL Blocked : The redirect failed because the redirect URL is not whitelisted in the app’s Client Oauth Settings”

I even tried to create new app step by step from the video and this message still apeear.

What can be the issue ?