I also tried on others Discorse forums and the preview doesn’t work, it only works here on meta 
Nothing I give up … I have tried everything but I don’t understand what blocks the preview of the Amazon links.
OK I found other useful information, I am writing because it could be useful to someone…
The problem is the same:
If I run curl https://www.amazon.it/dp/B07YSF42TT -v -o deleteme I get error 503 so I give up.
Do you know if there is another way to add an image and a short description?