Admin's would be defined the same way as JIRA core. Either in an admin group or specifying users for the Admin role within your Service Desk project. Either way, we have 4 admins in ours.
Hi Steve,
Yes there can be as many as you want. They are called agents and Service Desk pricing depends upon number of agents. https://www.atlassian.com/software/jira/service-desk/pricing/
However there can be unlimited customers who can open tickets via customer portal.
Hope this helps
Regards
Chander Inguva
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