URL with query string being indexed over it's parent page?

[iHasco]

I noticed earlier this week that this page - https://www.ihasco.co.uk/courses/detail/bomb-threats-and-suspicious-packages?channel=care was being indexed instead of this page - https://www.ihasco.co.uk/courses/detail/bomb-threats-and-suspicious-packages for its various keywords

We have rel=canonical tags correctly set up and all internal links to these pages with query strings are nofollow, so why is this page being indexed?

Any help would be appreciated

[Zohaibkhannn]

If the Disallowed URLs are linked to externally, or internally from a page that isn't Disallowed, they'll appear in the index with the snippet text you've quoted. If you want to ... Typically, that page will already be populated with parameters the crawler has discovered, though you can specify them manually too.

[TimHolmes]

I would suggest adding some URL parameters to your Google Search Console for the domain, it will help tell Google how to crawl and index your site... https://support.google.com/webmasters/answer/6080550?hl=en

https://www.shoutmeloud.com/google-webmaster-tool-added-url-parameter-option-seo.html - a useful read.

https://www.hallaminternet.com/avoiding-the-seo-pitfalls-of-url-parameters/ - another useful read.

Adding canonical's as you have already mentioned, would have been my second bit of advice. I am not sure why you have no-followed the links.

Cheers

Tim