We are experiencing the same issue on an iPhone XR iOS 14.4. We have been able to add Amex sandbox cards to this phone before. This worked 2 weeks ago.
On a test device that we already set up with an amex card. I just tried adding an additional amex card and it seams like the activation service is timing out. Same error the the previous person has called out.
iamericanboy
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