When using the Link Preview for my site it used to show a blurb, and a thumbnail in outlook when pasting the url. For some reason the thumbnail is no longer showing at all, and I have tried updating images within the site itself, updating the social sharing image etc and nothing has worked. It is still working for other sites so it is not just my outlook. Is there a way to set it to grab a certain image or a fix for this problem?
Example below of how in the same email, my website is not showing a thumbnail, but others are.