PSA to all Hosted JSS Users -
JAMF updates "shared instances" automatically on the Saturday following the latest release. This happens between 6am and 12pm Central Time. "Dedicated instances" (which typically for 500+ device count instances) are upgraded per request of the customer and these inquiries can be sent to the TAM, or Technical Account Manager.
Therefore, as of today, OS X 10.11 will not work with your JSS properly, merely due to the fact that we are still running 9.8, and 9.81 contains several key fixes for El Cap.
Carry on,
Mike