Why Cant I Challenge anyone?

I can't seem to challenge anyone in lichess, it is always showing You can not challenge user (the player's name)

Please helpppp

Your account is banned.

Read lichess.org/page/appeal to learn more about the appeal process.
Then use lichess.org/appeal to appeal.

Your rating is lower than a grandmaster. So that you can't play with them.

Sorry Hal, we're gonna have to pull the plug now!

@Yeltcki (It's a reference to an ancient film.) :)