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Hi, I hope this helps, Do NOT point desktop pages to m. pages via a rel="canonical" tags use rel="alternate" for that & make sure rel="canonical" tag on the m. URL pointing to the corresponding desktop URL Annotations for desktop and mobile URLs On the desktop page, add a rel="alternate" tag pointing to the corresponding mobile URL. This helps Googlebot discover the location of your site's mobile pages. On the mobile page, add a rel="canonical" tag pointing to the corresponding desktop URL. We support two methods to have this annotation: in the HTML of the pages themselves and in sitemaps. For example, suppose that the desktop URL is https://example.com/page-1 and the corresponding mobile URL is https://m.example.com/page-1. The annotations in this example would be as follows. Annotations in the HTML On the desktop page (https://www.example.com/page-1), add the following annotation: <code dir="ltr"><linkrel="alternate"media="only screen="" and="" (max-width:="" 640px)"<br="">href="https://m.example.com/page-1"></linkrel="alternate"media="only></code> On the mobile page (https://m.example.com/page-1), the required annotation should be: <code dir="ltr"><linkrel="canonical"href="https: www.example.com="" page-1"=""></linkrel="canonical"href="https:></code> This rel="canonical" tag on the mobile URL pointing to the desktop page is required. A page have a self-referencing canonical URL In the example above, we link the non-canonical page to the canonical version. But should a page set a rel=canonical for itself? I strongly recommend having a canonical link element on every page and Google has confirmed that’s best. That’s because most Sites & CMS’s will allow URL parameters without changing the content. So all of these URLs would show the same content: https://www.example.com/page-1 https://www.example.com/page-1/?isnt=it-awesome https://www.example.com/page-1/?cmpgn=twitter https://www.example.com/page-1/?cmpgn=facebook Using a mobile website version of their desktop version, they need to implement a canonical tag on their mobile website page with an URL of the desktop version. For example, Your main domain: iamexample.com Your mobile version: m.iamexample.com Then, have this tag in the section of your main domain - And, have this tag in the section of your mobile version page - Mobile-Specific URLs, Such as AMP Pages or a Mobile-Specific Subdomain Creating content with mobile in mind is a marketing must -- just be sure to remember to set your canonical URLs when you have pages that are specific to mobile but have the same content as a page on the desktop version of your website. For AMP pages specifically, Google also provides detailed guidelines on how to correctly differentiate your Accelerated Mobile Page from your standard webpage. SEE: https://developers.google.com/search/mobile-sites/mobile-seo/separate-urls https://yoast.com/rel-canonical/ https://moz.com/blog/cross-domain-rel-canonical-seo-value-cross-posted-content https://moz.com/learn/seo/canonicalization https://moz.com/blog/rel-canonical Hope this helps, Tom