Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
If you’re getting this error on your site, it means that Google has found identical or very similar content on your website, but has not been able to determine which page is the original/canonical version.
However, those pages you have shared don’t have canonical URLs in them.
Rank Math automatically adds the canonical URL on those pages, but if that’s not happening, assuming you are using the latest version of all the plugins and the themes (please update if not yet), it would seem like a conflict with one of the plugins or the theme you are using.
To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/
Here is a video you can follow as well: https://www.youtube.com/watch?v=FcIWRhcUP2c
Only the site admin would know and your users won’t be affected by this troubleshooting.
Let us know how this goes.
Thank you.
I checked for conflict as how you recommend and I didn’t found anything. If you can have a better look I will highly appreciate that. Thanks for your help and with you a nice day.
Hello,
I’ve checked again those pages, and the canonical URLs are already showing in the source code.
In this case, please revalidate the issue in your Google Search Console account and give Google some time to recrawl your site.

Hope that helps.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.