Update: The answer is no but you'll have to look at the last few comments
I've posted about this before and I'm always told it's not a problem. If it's not a problem, why does Google and now Bing constantly send me emails like this one.
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Canonical tags can be used to help de-dupe URLs for pages with the same or very similar content. Bing has detected that your site is using what appears to be the same canonical URL for a large number of pages that are not the same. This may be indicative of a problem with your HTML template, content publishing system, or site code. You should review the source of your pages and check if the URLs used inside the <link rel="canonical" href="<url>" /> are not accidentally pointing to the same location for all (or too many) pages.
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Not indexed as this page is an alternate version of a canonical page
URL cannot appear on Bing
Discovered on 21 Jun 2023
Last crawl attempted 21 Jun 2023 at 00:43
Crawl allowed? Yes
Page Fetch Successful
Indexing allowed? Yes
Canonical URL:xxx
This page is an alternate version of the similar page which you have specified as canonical version using a <link rel="canonical"> tag. Bing does not index the alternate version.
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No matter what I do, both search engines keep complaining about this and I've no idea how to fix it. We badly need our forums to be properly indexed and we're not seeing that after using nodebb for probably over two years now.
Any thoughts?