Code=513 couldn’t be copied because you don’t have permission to access “Group Containers”."

I am working on a macOS application in sandbox mode. I have enabled App groups and I can see the app group folder gets created. I am attempting to move a file from the app directory to the shared group but im see a permission error.

Code Block
Error moving files Error Domain=NSCocoaErrorDomain Code=513 "“Container_1595437210.503603.txt” couldn’t be copied because you don’t have permission to access “Group Containers”."



Any ideas?
How are you calculating the source and destination URLs?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"
Code=513 couldn’t be copied because you don’t have permission to access “Group Containers”."
 
 
Q