Duplicate, submitted URL not selected as canonical: what does it mean and how to fix it?
“Duplicate, submitted URL not selected as canonical” indicates that you submitted URLs without a canonical URL, and that Google considers the submitted URLs to be duplicate. Therefore, Google's chosen other URLs as the canonical.
Please note that this status is highly similar to the Duplicate, Google chose different canonical than user status, the only differences being that you explicitly requested these URLs be indexed by Google, and that you didn't include a canonical URL.
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How to fix “Duplicate, submitted URL not selected as canonical”
Submit your site and find out if any canonicalization issues remain!