Hi @Gary_Elliott , welcome to the Community!
Confluence Server licenses are for a specific install, applied individually. Rather than being cumulative, having two separate licenses means you can run an instance with 10 users, and a separate instance with 25 users. You would not be able to put 35 users on a single instance.
Calling all Confluence Cloud Admins! We created a new Community Group to support your unique needs as Confluence admins. This is a group where you can ask questions, access resou...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events