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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.

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?