Google Search Console

I received four messages from the Google Search Console Team over the last two days. Two of these where for my site (https://pideja.ca) and two others for a site I manage.

What do these messages tell me? What, if anything should I do?

Message type: [WNC-20237597]
Search Console
New reason preventing your pages from being indexed

Search Console has identified that some pages on your site are not being indexed due to the following new reason:

Page en double sans URL canonique sélectionnée par l’utilisateur

If this reason is not intentional, we recommend that you fix it in order to get affected pages indexed and appearing on Google.

Open indexing report
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A Google search came up with this

Do you have pages that have the same content?

Hi Rod,

The pideja.ca site is a photo-database of stage productions I documented since 1989 so, in a way, there are many pages with similar content. The other site I manage is an artist’s site that has a few pages like an “about”, “bio”, “contact” and others. Among these, of course, there are pages illustrating his work.So, I guess you could say they are similar.
Thanks for the link…I will read it and try to make sens of it.