I am also having this issue but only on iOS 13 devices. iOS 14 devices can purchase no problem.
glenn emmanuel
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
Issue exists on iOS 13 device. No issue found on iOS 14 device.