To combat the spread of misinformation on their platform, Facebook disabled the editing of metadata for most links posted to their service, both natively and via third-party publishing tools like Sprout Social.
However, they still want to provide a way for publishers to post and configure engaging content from verified websites, and have introduced Domain Verification to allow content creators to edit metadata.
Sprout Social users who have verified their domain(s) in Facebook will be able to continue editing link metadata for links that point to verified domains. If you do not verify your domain in Facebook, you will no longer be able to edit link metadata, even for your own website.
To verify your domain, please refer to Facebook's documentation.