I just checked my public profile on FCC and it’s got some buttons to view the solutions I made; most of them are projects, but some are challenges and on those, the link is broken.
Attached there is a screenshot of the Caesar’s Cypher challenge, showing the button to see the solution I made…
…and the 404 page I get when I click it.
Maybe it could be something related to the challenges made in previous version of FCC since I did those challenges on march.
Hope it helps solve some bugs