The Open Graph description controls the preview text when shared on social media. Without it, platforms may generate one which may not be compelling.
What to do: Add an Open Graph description (og:description) to the page. This is usually generated from your page's SEO description, but if it's missing, you may need to review your theme settings or code to ensure an OG description is being generated correctly for this page. This helps control the preview text shown when the page is shared on social media.
How to fix: Since OG settings are handled by your theme, you should ask your theme’s developer/support to add an OG description for you.