When we attempt to copy a contact to a sharepoint list contact folder (edit / copy to folder) some contacts end up in the Sync Issues / local failure folder.

Copying or attempting to move from the local failure folder produces a duplicate in the local failures folder and if we attempt to add a new contact directly in the sharepoint lists contact folder it also ends up in the local failures folder.

Some contacts copy with no problem (from Outlook Contacts folder).

All other syncing and saving to workspaces works fine.