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ITMS-90424: Invalid Swift Support
You will see this error if you are submitting an app with an ad-hoc provisioning profile instead of release profile. Please ensure that you’re not submitting an ad-hoc build.
Personally, I was exporting my .ipa as an ad-hoc preview and/or internal build file using expo, and then tried to submit that to TestFlight — but I should have been exporting a production build.