We're trying to direct the user to subscription management.
Apple documentation here:
Letting Users Manage Subscriptions
Suggests opening this URL:
https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/manageSubscriptions
This works fine on the Mac, but on iOS 10 I just get a white screen with the Carrier/Battery bar. This is true even if I just Paste that URL into Safari. What am I doing wrong?