From 22nd December - 29th December, iTunes Connect, Application Loader, and iTunes Connect for iOS will be unavailable.
During this time, we will not be able to submit new apps, app updates, or create In-App Purchases. You also will not be able to access iTunes Connect or make changes to TestFlight Beta Testing. You can schedule an app release or price changes to take place between 22nd December and 29th December. Please make sure that your changes are scheduled, submitted and approved by 18th December to ensure your app remains available during this busy period.
Users who are currently testing or invited to test your pre-release apps with TestFlight Beta Testing will not be affected.
You can also request Sales and Trends reports during the downtime by using the Autoingestion tool. Note that these reports may take longer to become available.