Trying to invite yourself to your own realm tells you that a player with that name doesn't exist

When a realm owner tries to invite themselves to their own realm, the game shows the message "A player with the provided name does not exist", which is obviously not the case.

How to reproduce:

1. In your realm settings in game, go to the Players tab.
2. Click Invite player.
3. Type your own username.

Expected result:
"You cannot invite yourself to a Realm you own!"

Observed result:
"A player with the provided name does not exist"