Note: Sometimes Facebook’s system is a little flaky. After you create or edit a link it can take up to 1 hour or longer for the preview to work properly on Facebook if you’re using custom meta data (title, image, etc).
… And occasionally it won’t work at all in which case you should simply try editing your link (even if you don’t change anything) which will signal Facebook to try fetching the correct info again.
Facebook also employs various caching mechanisms that can cause you to see outdated meta info if you add it or change it after you’ve initially created the tracking link.
In this case you should use Facebook’s
Open Graph Debugger Tool to “Fetch new scrape information.”