Using maximum width when slicing in Ultimaker Cura
Take a look at this post: https://community.ultimaker.com/topic/15588-cura-23-not-using-full-print-area/. As the raft/skirt/brim will fall outside of the build volume, Cura is not able to slice it. Look at the the answer by @ahouben. He suggests that if you want to use the maximum build volume : 


  
  adhesion type = brim
  brim line count = 0
  travel avoid distance = 0
  horizontal expansion = 0
  support horizontal expansion = 0 (if support is enabled)
  draft shield disabled
  ooze shield disabled
  infill wipe distance = 0﻿
  
  
  Note that in most cases brim with brim line count=0 will get you most of the way there


Try this and see if it makes a difference.