App Store Connect Dashboard-App does not show TestFlight tab

Hello Apple experts. Yesterday all was fine with each Dashboard-App in my account. But today, suddenly, the Dashboard-App does not show the TestFlight tab. It is not a problem for one specific app, the problem is for all the apps inside my account. Only we can see the "App Store - Services - Xcode Cloud" tab-sections. Why the TestFlight tab-section is missing? Anyone else experience this ?. Thanks in advance.