Background Enchantment flagged as an Error

{"ops":[{"insert":"The error is definitely confusing because of our messaging, but it's actually triggering because you have three cards in the command zone and part of the background check is to make sure there is *one* other card with \"Choose a Background\" with it. If you remove Yorion from the command zone, the Candlekeep Sage error will go away.\n\nIt looks like you intend for Yorion to be your companion. There is a \"Set as companion\" button that appears when you left or right click on the card. Just be aware that since Yorion is banned as a companion in commander, you'll end up with a new error for that.\n"}]}