The build finally showed up about 10h after uploading it. Apparently waiting patiently fixes this particular issue. :-)

sadly count me in :)

I confirm, that we are suddenly and for the fist time affectected by the same issue as well. Usually, for the last weeks, after uploading to AppStoreConnect the new build would show up within minutes in TestFlight's webinterface of AppStoreConnect. However, since many hours it is showing just a grey box - without contect: The build also isn't available for testusers within their TestFlight app. An email of the successful upload was received, however. Apple Developer System Status shows all systems as working fine: https://developer.apple.com/system-status/ This seems to have happend in the past also: https://developer.apple.com/forums/thread/717127?page=2 However, I don't found an actual fix within those old threads. It would be nice to learn, whether "just waiting some more hours" will magically fix this - or there is some new configuration or another solution required to fix this on our side? Any good advice is greatly appreciated! :-)