Thanks for posting. I am still facing the same issue. My app build contains extensions and xpc as follow:Finder Sync Extension (sandboxed) - XPC Service (not sandboxed) For an example of such a login item, see AppSandboxLoginItemXPCDemo. I've applied this example but It also doesn't work. And I don’t think this cause because XPC service is not sandboxed. do you have good experience with this recently? Is there a updated way for a communication between xpc and finder sync extension? 

It's same issue for me. when I upload the file to the server, I try to archive the file. #include "archive.h" #include "archive_entry.h" .... archive_entry_set_mtime(entry, st.st_mtime, st.st_mtime * 1000); Error: Your app uses or references the following non-public or deprecated APIs: archive_entry_set_mtime • Contents/MacOS/Myapp/_archive_entry_set_mtime • Contents/Resources/MyappExt.app/Contents/MacOS/MyappExt/_archive_entry_set_mtime • Contents/XPCServices/MyService-xpc.xpc/Contents/MacOS/MyService-xpc/_archive_entry_set_mtime ...