I have double-checked the rel canonical is properly employed on our page but the On Page Grader says it's not working?

[StratasysDirectManufacturing]

I have double-checked the rel canonical is properly employed on our page but the On Page Grader says it's not working

Here is the URL - http://www.solidconcepts.com/industries/aerospace-parts-manufacturing/

What is wrong with how we are doing things?

[StratasysDirectManufacturing]

Thank you all - I had attempted to default the canonical reference to http - however, a setting within Yoasts SEO plugin was forcing all canonical references to https and the logic evaded me. I've changed the setting and it reports fine on the On Page Grader now.

[MoosaHemani]

Ok, you are kind of misleading Google by this... canonical tag tells Google that where the original content is located. According to your signal it is location on your https version which is redirected back to http so in other words your original content is located to a destination which is relocated to some other URL....

All you have to do is to remove just an s from the canonical version and all will be fine!

[Saijo.George]

You page http://www.solidconcepts.com/industries/aerospace-parts-manufacturing/ says the canonical version is the https version of the page : https://www.solidconcepts.com/industries/aerospace-parts-manufacturing/, but the https version does a 301 to the non https version, so you are sending mixed signals to google.

[danatanseo]

Could be because the canonical is to the "https://" version of the page instead of the "http://" version. Was this done intentionally to avoid duplicate content issues between the two? Could be the page grader is having trouble distinguishing one from the other. Just a thought.