Pinterest error when trying to pin, cannot communicate with my blog

Hi,

I am trying to pin this post, using the first button with the hidden image, and each time I try to pin I get an error that I pinterest can’t communicate with my blog.

https://www.gilsousa.eu/kotor-uma-perola-adriatico/

What can be the problem? I checked the image size, and it is less than 1MB, so I assume that wouldn’t be a problem.

https://www.ads-software.com/plugins/pinterest-pin-it-button/