In an announcement on the application developers blog, Apple warned of scheduled maintenance work that will take place on October 20th . Here’s the details.
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Hours ahead of Pacific Time on Sunday 6: 00 (Turkey clock 16:00) will take approximately 8 hours of maintenance work which will start specified. During the outage, some services were unavailable, but it was announced that App Store Connect is a browser and mobile app, API service, and Developer ID. Since maintenance planning is intended exclusively for developer services, consumer-oriented services such as the App Store will not be affected .
Apple apologizes to developers for this mandatory maintenance and says it would be better to schedule critical updates or releases for their applications on another day. To check the real-time status of services throughout the process, visit https://developer.apple.com/system-status/.