I have spent a couple days on this issue. I also tried going back and forth from default container id to using the identifier. I am using an example found from iOS Academy (https://www.youtube.com/watch?v=Og-2A5n5IAY). I was able to get it to work once, but repeating the exercise in a new app copied exactly from the previous one, with exception of changing the app and container name resulted in the same error messages. There seems to be some very random happening. Now I cannot get it to work at all with the same code.
markv07
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
A few methods deprecated, but this approach still works. This is the simplest example I have seen. Thanks
Spoke too soon. This brings up share windows, but any link sent through email will be a dead link (unavailable or user stopped sharing), and it will not execute imessage.