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This may or may not help: Re: Just when I was sorta-kinda understanding the new permissions of 2018.1 I read this...
It's best to talk with your Tableau account representative about your particular licensing environment. However, from what you described you would be a user-based license environment. If you are a core-based licensed environment then you should have installed it as such. With core-based licensing you still can use user/subscription licenses (e.g. Creator), you will not "lose" your core-based licensing when including subscription licenses.
I think if you register your core-based licenses your environment will 'switch' to a core-based one. Again, check with your account rep.