Anyone know about Canonical tags?

I’ve applied the following to my .htaccess file for www.dibleymarine.com

However - on checking it, it doesn’t seem to work

I’m sure it’s just a syntax problem - but it’s beyond me

Funnily it worked right away for peteryates.co.uk

RewriteEngine On

RewriteCond %{HTTP_HOST} ^dibleymarine.com$ [NC]
RewriteRule (.*) https://www.dibleymarine.com/$1 [R=301,L]

edit …

Sorry for the first incorrect answer earlier — I only noticed it now in the source code.

One page was created with RW Classic (Stacks) and the other with RW Elements.

In Elements, the canonical meta tag is generated automatically for regular pages.

In RW Classic, however, you need to set it manually for each page, unless you use the SEO tool from a well-known third-party provider.