項目レベルセキュリティの接待対象が権限セットに変わっている

今までベータ機能だったのですが、権限セットがデフォルトになったみたいですね。
プレイグランド、DE環境ではちょっと注意です。

• I have created a new field for position object named approvers 1 which is reflecting in fields and relationship of that object but in the challenge it is throwing error that approvers is is not found on position object although it's reflecting in fields

システム管理者が出てこない

Try disabling the following settings

Go to Setup -> Users -> User Management Settings & Enable “Field-Level Security for Permission Sets during Field Creation ”

Field-Level Security for Permission Sets during Field Creation
Set field-level security for permission sets when creating or editing custom fields. When this option is enabled, you configure access to the new field for permission sets instead of profiles.