Hey there,

Can you check what error message did google search console give for the AMP version?

We just tested https://www.storzmedical.com/es/especialidad/urologia/base-de-datos-de-literatura-sobre-swl/base-de-datos-de-literatura/entry/shinde-s.html?format=amp in the Google AMP test tool and the result shows it is a valid AMP page.

The following link is the result of it:

[gist type="php"]
https://search.google.com/test/amp?id=afND3N6cDqskp0tW_dklhA
[/gist]

Hey Oliver,

It is not necessary to index those ?format=amp urls because in each of your blog posts, EasyBlog has already added the necessary metadata to inform crawlers that there is an AMP version of the post

Hi,
Thank you for your answers.
The error message is, that Google was blocked from them robots.txt (because we set Disallow: /*? and Disallow: /*=).
And the blog url name has a "?" and "="
After deleting Disallow: /*? and Disallow: /*= in robots.txt it's all ok. But to avoid duplicate conten from joomla we would like allow URLs with "?" and "="

I am actually a little lost here. Having the ?format=amp will not cause any duplicate urls. These are amp specific pages and Google will not treat them as duplicate contents.

This is a joomla Problem. Different kind of links shows the same page. For example:
/index.php?option=com_content&view=article&id=2
show the same page than the seo optimized link. Booth versions would be crawled from Google. So you have the problem with the duplicate content.
To avoid this Problem, you set
Disallow: /*?
Disallow: /*=
in robots.txt
But now, Google can't crawl easy blog AMP articles, because "?" and "=" is a part of the url

Unfortunately there is no way to remove the ?format=amp in the URL because without this, Joomla will treat it as a normal html view. By the way, as long as there is a canonical tag on the page, it is actually perfectly fine.