Site name in link preview is missing. "3.2. Link preview .... - The site_name property must include the correct name of the website. If the webmaster includes unnecessary data (e.g. ‘Site {sitename}’) or mixes the site name with the article title, your template must take care of this. "
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"3.2. Link preview
....
- The site_name property must include the correct name of the website. If the webmaster includes unnecessary data (e.g. ‘Site {sitename}’) or mixes the site name with the article title, your template must take care of this. "
https://instantview.telegram.org/checklist#3-2-link-preview