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I had a problem with Open Graph. Posts are in the same news category, some posts can display the og:image tag, some posts cannot, even though I have optimized the image size and image capacity. You can see the picture I have attached Thank you all!
Try to debug this on your end first. W/o sharing the actual URL here, nobody else can do this for you.
thanks for answering me. This URL display og:image https://www.vlu.edu.vn/news/truong-dai-hoc-van-lang-dat-chung-nhan-kiem-dinh-chat-luong-co-so-giao-duc-theo-tieu-chuan-fibaa but this URL cannot https://www.vlu.edu.vn/news/truong-dai-hoc-van-lang-ghi-danh-trong-bang-xep-hang-dai-hoc-toan-cau-ve-phat-trien-ben-vung ,even though I have optimized the image size and image capacity for this URL.
See Sharing Debugger: "URL returned a bad HTTP response code" (returns 418, I'm a teapot, which is basically a 403 forbidden). Check your server logs to fix the issue.