Please make sure the prework is configured in the playground.
やっと解答をみつけたかもしれない。
この画面が出た場合は、一度ユーザ管理設定の「有効期限のある権限セットおよび権限セットグループ」を無効にし、再度有効に変えてからChallenge確認ボタンを押してください。
英語では
If this screen appears, disable "Permission Sets and Permission Set Groups with Expiration Dates" in User Management Settings, enable them again, and then press the Challenge confirmation button.
I managed to complete it by using a combination of the docs, and the instructions for the challenge. I don't know if you have to put the button and everything, but I did and it worked, just like this doc page shows, except with the property values specified in the challenge. https://developer.salesforce.com/docs/component-library/bundle/lightning-confirm/documentation