Xcode Version 10.3 ITMS-90035: Invalid Signature

Issue

I am trying to upload a signed ipa file to the app store but I keep receiving an error message saying:

ITMS-90035: Invalid Signature - A sealed resource is missing or invalid. The file at path [Inuttut.app/Inuttut] is not properly signed. Make sure you have signed your application with a distribution certificate, not an ad hoc certificate or a development certificate.

I'm building the app with Cordova/Ionic 3. I have a valid Distribution signing certificate and provisioning profile for the app. I have triple checked that the bundle id is correct, and I have also set the Xcode build to use the legacy build.

One thing that has me wondering is that when I'm in Xcode and select "Automatically manage signing" it sets my signing certificate to iPhone Developer instead of iPhone Distribution. Signing the app this way and uploading it produces the same error as unchecking "Automatically manage signing" and manually selecting the iPhone Distribution certificate.

Solution

I found the problem. Frustratingly, it had nothing to do with my distribution certificate or anything like that, so kudos to Apple for the wild goose chase. It was simply because I have some assets which have non-ASCII characters in the filename. This is exactly the kind of linguistic bias that makes developing software for non European languages difficult. In any case, I recommend looking for any files like that - hopefully my pain and suffering over the past few days will help somebody else.

P.S contacting Apple directly was a fruitless and infuriating experience, so don't bother.

Answered By - A. Pine