@alex_pisa
The error "Duplicate without user-selected canonical” indicates that Google found duplicate URLs that are not canonicalized to a preferred version. Google didn't index these duplicate URLs and assigned a canonical version on its own.
How to fix this issue
Should these pages even exist? If the answer to this is no, simply remove these pages and return a HTTP status code 410.
If these pages have a purpose, then ask yourself whether they
carry any value:
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If yes, then canonicalize them to the preferred version of the URL. Need some inspiration where to canonicalize to? See which URL Google finds most relevant using the URL Inspection tool(opens in a new tab). If Google's listing PDF files for your site, canonicalize them through the HTTP header.
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If these pages don't carry any value, then make sure to apply the noindex directive through the meta robots tag or X-Robots-Tag HTTP Header.
