Discord OAuth presents an error when setting username

When signing up for a new user account using "Login with Discord", the OAuth flow doesn't appear to set a username on the account properly. Instead, after authenticating with Discord, I received a MutationError popup on the page when setting my Username (specific details weren't captured).

Steps to reproduce:

1. Create a new account using discord OAuth.

2. Enter a new username, hit "set name".

3. You'll see the error appear.

4. Logout and login using oauth again, the name will appear to be set on the account.