Im having the same issue since few days. Sometimes it fails before uploading telling me "credentials invalid".
I have updated all keys, profiles etc. and still same thing. Today I will try from another computer
Forti
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Same here, tried 3 times
Same issue here, tried 3 times
Same here - build showed up for a while in App Store connect TestFlight - and after a few it's missing. I've tried twice - both the same issue.