Hi Johnny,
I think it might be a network related issue.
the last 60 minutes I have runned the command Start-OnlineCoexistenceSync and this is the result:
I've had run the command 10 times and only 3 times it was successfull.
Is there a sort of a limit to run a sync? Or could it be a firewall which occasionally blocks/allows the sync?
Regards,
Yannick