When publication error happens it logs following message:
info.magnolia.publishing.command.PublicationCommand - Receiver: magnoliaPublic, error: [WEBAPP: [magnoliaPublicMaster, Publishing failed, please contact your system administrator to help you resolve the issue.]] Message: {1}

At the end of the message these is {1}

which seems to be a placeholder in the message that is not replaced when generating the message.

Further more it seems annoyingly hard to find any logs that actually tell what the error is that caused publication to fail.