My latest post is not being shown in RSS Readers

That error is a red herring, it won’t actually cause any problems. “This is a valid RSS feed.” is the important part of those results. ??

It looks like your latest post is in your feed when viewed directly in Firefox, so maybe the other RSS readers are just taking time to re-fetch the feed: https://screenshots.firefox.com/5Fdlwri795hDS4v8/www.gilsousa.eu

That’s really strange, I can’t see it in both Feedly and here:

https://www.bloglovin.com/blogs/blog-de-viagens-look-left-17630261

Both of those services refresh feeds at a rate determined by how many subscribers they have in their system, they don’t operate in real-time.

2 days is a bit much though, I recommend getting in touch with their support, since your feed is valid and does work.

Thanks! I will do that