I'm building a tool that works with contact cards (iCloud CardDAV as source). I need to obtain the pronouns set for a user to know if they are to be addressed as a he, she, etc. Pronouns set on a contact in Apple Contacts sync to iCloud and appear on the CardDAV vCard as itemN.X-ADDRESSING-GRAMMAR, but the value is opaque after base64 decode (not plaintext, XML plist, or binary plist). Third-party CardDAV clients authenticated as the account owner therefore cannot read pronouns, even though other contact fields (name, phones, emails, related names, etc.) are readable. RFC 9554 PRONOUNS is not present on these cards. How do I get these from contact cards?

I'm developing an app and I think I've implemented what I need to in the swift code. However, when I click the Purchase button in my app, I see "Cannot connect to App Store" when the App Store app opens. Attached are images showing how I've configured the Sandbox user. What am I doing wrong? I expect to be able to do a fake purchase to test subscription activation in the app, but it doesn't work.