Private Code Failed publishing error in Fortnite Creative

Fortnite Island Developers may run into the following error when trying to publish a private island version in Fortnite Creative:

PRIVATE CODE FAILED
There was an error while creating your private code. Fix the error and try again.
errors.com.epicgames.fortnite.content_service_request_failed

If you expertience this error, please wait 24-48 hours and try to publish again. If the error persists after this time, contact our support team.