In Enterprise 11.3 and before when you had staging license and the same people works with the production and staging you could copy the Enterprise license (json file) and use it on staging Enterprise too.
In 11.4 you must give a full machine name when you create Enterprise json license.
Now you can not use the same file for production and staging.
What is the solution? MyEsri does not let you create Staging json even if you have staging Enterprise. It does give you separate server license.
Thanks