Having this issue now in React Native project having upgraded to RN 0.63.3 and Xcode to 12.1. Not sure what to do....
innoved
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In our case it was because we were using the ad-hoc provisioning profile rather than app-store. We've always done this but something seems to have changed (maybe xcode 12, maybe something on the store side).
Switching to app-store made it work, though the .ipa to be uploaded through transporter is roughly 10 times the size (not sure why, I hope the app size as apparent to users isn't similarly bloated).