can’t sign up for instagram

Hey

I am trying to sign up with instagram for a new account. Whenever I choose a username it shows "Sorry, that username is taken." then I click on the round arrow for automatic username generator and I click sign up and i get an error "Sorry, something went wrong creating your account. Please try again soon." and if I click again I get the same as first message "
Sorry, that username is taken."

so what's wrong? why can't I sign up?