Let’s keep it simple and straight to the point, with indexing as our prospective focus.
Let’s try to understand what a canonical tag/url is with an example:
You submitted link for indexing: https://hiutdenim.co.uk/collections/mens/products/italian-selvedge-the-v-fit-tapered-fit but these link has a “canonical tag” in its source code added by the Webmaster or Web Developer to inform all Search Engines that this page/post is a duplicated copy and the Canonical URL (original link) is this: https://hiutdenim.co.uk/products/italian-selvedge-the-v-fit-tapered-fit so Google skips the link from indexing because it’s a duplicate content link google don’t want duplicate content to be indexed.
So your job is to submit the Canonical URL only for indexing; it is the original/main link.
How do I find if my link has a Canonical URL tag or not? For that please download our Indexsor Indexability Checker Chrome extension! Here, you check your link indexability and you can also see the Canonical URL link.
Indexsor Indexability Checker Screenshot:

So, do all websites have Canonical URLs? The answer is No. Modern and well SEO structured websites don’t have Canonical URL links because they create confusion for Users + Search Engines and cause indexing issues.
So you need to check your Indexer Campaign if it has “Indexability: Canonical” for any link. The easy way is to download the campaign by clicking the “Download Campaign” button and downloading the .csv file.
Indexer Campaign page screenshot:
Download the Campaign .csv file screenshot:
Open the downloaded file in Microsoft Excel and check for “Canonical URL” columns there you will find all your Canonical URLs, copy all url’s and create a new “Indexer Campaign” and submit them for indexing. But before submitting, recheck that all your canonical URL pages are live, have the correct content, and contain the appropriate backlinks.
For easy follow-up try to name your “Indexer Campaign” name like “canonical-links-5689” or “c-links-5653” or “cl-4566” so on.