This worked for our 2.1 CE installation. Disable single store mode (admin>stores>configuration>general>general) Assign a store view to the CMS page. go to your cms pages ( admin>content>pages) edit the page which gives you the 404 message Set the store view to “All Store Views” save the page enable single store mode(admin>stores>configuration>general>general) refresh cache (admin>system>cache management)

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