Don't know if my issue is the same as the OP, but for a couple of weeks now I have been unable to upgrade through the iOS app (tried both iPhone and iPad). When I click the *Upgrade* button, I get a "Connecting to the App Store..." message with the little spinner (see screenshot below). I tried logging out and logging back in, deleting the app and reinstalling, nothing seems to work. Was hoping the latest update would fix the issue, but still no joy.
Moderator Edit: Edited title for clarity
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