Updating username isn't reflected in the dashboard

After authenticating with LoginWithDeviceId I attempt to update the user account display name with something usable with the following code:

    private User _user; //Acquired from ApiClient
#if UNITY_EDITOR || DEVELOPMENT_BUILD
    private const string DEV_EMAIL = "example@example.com";
#endif

    private void UpdateUsername()
    {
      string username = $"Player{UnityEngine.Random.Range(0, 9999)}";
      
      void UpdateUsernameCallback(Result<UserData> result)
      {
        if (!result.IsError)
        {
          PlayerName = result.Value.displayName;
        }
        else
        {
          LogError("UpdateUsername", result.Error);
        }
        _updatingDisplayName = false;
      }
      
      _user.UpdateUser(new UpdateUserRequest()
      {
        emailAddress = DEV_EMAIL,
        displayName = username
      }, UpdateUsernameCallback);
    }

I get a successful response which even includes the new username but when viewing accounts in the dashboard it doesn’t appear to have taken effect.

Additionally, I found it confusing that I had to include an e-mail address in order to update a username - the API doesn’t allow updates without one it seems.

Using AccelByte Unity SDK 16.24.0

Hello @GG_JamesBattersby,

We are sorry for the confusion. To update display name, you may use _user.Update(). This interface wouldn’t need e-mail address.
Also to update account display name, please set UniqueDisplayName instead of displayName.

_user.Update(new UpdateUserRequest()
{
  UniqueDisplayName = username
}, UpdateUsernameCallback);