The updated Apple Developer Program License Agreement needs to be reviewed.
In order to update your existing apps and submit new apps to the App Store, the user with the Legal role (Team Agent) must review and accept the updated agreement in their account on the developer website.
4月21日23:00（日本時間）より最大8時間、iTunes Connectは利用できなくなります。重要なデリバリまたは変更はこれ以前に行ってください。