I also can't view leaderboards for some reason or import my profile; for the leaderboard, it says Error: Failed to load leaderboard and for the profile it says Failed to download user profile from the server
I have the same problem, Leaderboards are down at the moment of typing atleast
I've noticed the leaderboard issue specifically on sites like pizza edition. It hasn't been a problem for me though on the official site or app.
It's not possible to import your profile if the leaderboard server is down.
It's also not possible to import profiles from illegal versions of the game since those versions can't upload the profile to the server
