thanks to dear member @deeph203 submitted a new resource:
Safemage URL Optimization for Magento 2 - URL Optimization for Magento 2
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Safemage URL Optimization for Magento 2 - URL Optimization for Magento 2
Migration from Magento 1 to Magento 2 often leads to a problem to save some categories on the backend. There appears this unavoidable error “URL key for specified store already exists”. Our team has thoroughly investigated the problem and come to a conclusion there is no unified and reliable solution to thrash out the problem. Even if you managed to remove all duplicated URLs, the error would surface again after another "Save" procedure.
The extension can help you remedy all post-migration...
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