This URL shows my certification: freecodecamp.org/certification/ambercahill/foundational-c-sharp-with-microsoft
This URL displays a loading screen forever and no content: freecodecamp.org/certification/AmberCahill/foundational-c-sharp-with-microsoft
The only difference is the case of “AmberCahill” vs “ambercahill” - when I first got the certification, the URL I shared to LinkedIn included “AmberCahill”, so it hasn’t been reachable from there for who knows how long.
Tested on Opera GX and Microsoft Edge on Windows 11, in Sydney, Australia