If I start composing a post for Facebook or LinkedIn, as soon as I paste a URL Zoho Social pops up an error saying 'Unable to generate preview thumbnail for this URL'.

However, if I trigger the Zoho browser extension on the target page, then it does generate an image preview without any issue. See attached screenshots.

This can be tested with the following URL: https://www.icr.ac.uk/news-archive/chemotherapy-after-surgery-halves-risk-of-rare-kidney-cancer-coming-back

The relevant opengraph tag in the above page appears (to me) to be correct: