Ok, so it is two months later, might I be so bold as to ask if there is any solution for mac users yet?
Following the “#!ResetLocalSync” addition to the email address, the sync still only throws a 2 second “Authorizing” message and does nothing else. Endnote on Windows does complete the process allright, but then again, I never had problems with assynchrone local library on my windows systems in first place.
mac OS X 10.11.6, , endnote X7.7 (Build 11722)