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I migrated site from Magento version 18.104.22.168 to Magento version 2.3.1 afterwards when I open all product shows 404 page not found error in front-end
I have to fetch the same issue so Please, a check-In Database View is created or not If a View is not there so create view after indexing and flush...
may your issue resolve...
I had this issue and what fixed it for me was fixing the images, because they got corrupted in the migration.
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