Hi @gsoundsgood,
It seems that your issue here is similar to what is reported on https://core.trac.ww.wp.xz.cn/ticket/39157
There’s a fix mentioned on that ticket that should solve this issue. It would be great if you could test that patch on your site. See https://make.ww.wp.xz.cn/core/handbook/tutorials/working-with-patches/#applying-a-patch for some instructions on how to test a patch.
Hi @erricgunawan, thanks for your reply.
Actually, looking at the description, it does not seem to be the same issue. In my case, the feed is actually generated: see link. There is no 404 error as described in that issue.
If I look at the source of the feed, it looks very much like a normal feed. But the generated feed is invalid, validators don’t accept it, and standard software/platforms don’t read it.
If after having looked at the feed, you still believe that my case is related to that issue, I’ll try to apply that patch.
thank you for your support!
Hi @gsoundgood,
To be honest, we can’t really see your feed (http://giorgiocomai.eu/wprss) in the browser at the first place. Here’s what we got when we try to check it:

It’s probably blocked from where I try to access that URL.
But we can see that the feed does indeed not validate from here:
https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fgiorgiocomai.eu%2Fwprss
Also, when we try to validate other feed that is coming from your site (we assume you have a default feed on this URL: http://giorgiocomai.eu/feed/), it also doesn’t validate:
https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fgiorgiocomai.eu%2Ffeed
Hence, we were thinking if you have a similar feed problem as is reported here: https://core.trac.ww.wp.xz.cn/ticket/39157
You can also try to contact your hosting provider or site administrator regarding this. Since both your default and custom feeds do not validate, there might be some server setup (missing libraries or such) that cause this issue. We won’t know for sure about this.