When accessing a Service Desk Project, queues, SLAs and other functionality are not visible as per the screenshot below. In this example the project is a JIRA Service Desk project.
Additionally attempting to access any settings through Project Administration leads to permission errors as below.
Errors will not be present in the logs.
If the symptoms above apply it's likely that you could be affected by this behaviour.
The user is either not a JIRA Service Desk agent, or the permissions are configured to allow them access.