iTunesConnect returns 'nil' as localizedTitle for SKProduct

Roll back your version number in Xcode.

For example, in my situation, I had MARKETING_VERSION=1.23 in Xcode. I had submitted this on App Store Connect as version 1.23. Apple then rejected version 1.23 in review. After this rejection, SKProductsRequest continued to serve a list of SKProducts, but each product's .localizedTitle and .localizedDescription were set to nil.

In Xcode, I changed my version number (i.e. MARKETING_VERSION) back to 1.22. After this, the .localizedTitle and .localizedDescription were served correctly again.

Temporarily changing the version number is a workaround for testing and development prior to resubmitting your app for review.

This is surely a bug on Apple's side. I have submitted a bug report here, but it seems like I can't get a public link to the report.

I've found solution at devforums.apple.com

https://devforums.apple.com/message/966757#966757

Basically it appeared that each product language had status rejected (while product had status waiting for review). Adding new language to each product solves problem.