To start with, it is worth me noting that this process was working perfectly for 2 years. It started failing intermittently about 2 weeks ago.
We enable our clients to share a URL with a custom OG image to Linkedin via our Linkedin application.
Currently, it is presenting with no 'preview' image like so https://www.linkedin.com/feed/update/urn:li:activity:6811038971855020032/ (screenshot https://i.imgur.com/I8OsZy1.png)
However, when checked using LinkedIn Post Inspector it works perfectly https://www.linkedin.com/post-inspector/inspect/https:%2F%2Fjobadder.refari.co%2Fsocial%2F8e3284ec-d6b8-4d0b-b6a8-cb2a19a56432%2F (screenshot of the same thing https://i.imgur.com/dYItzDI.png)
If I take the URL and paste it manually into LinkedIn it also fetches the OG image with no issues. https://i.imgur.com/S0TTVE7.png
Worth noting that the image being fetched in this example is 438kb (so not large)
As far as we can tell this is an issue with Linkedin fetching the OG image but I am more than open to being told otherwise. Any help at all would be very much appreciated.