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You're correct in that a core license comes with a "guest account". By chance is there a trial key that was enabled on that instance of Tableau Server as well? Also, it doesn't happen often but occasionally the key we provide may have accidentally not been the correct type (possibly a User based license instead of Core based). Would strongly recommend to open a support case so we can work with you and our licensing team to get this one resolved:
There is an issue with the license configuration. Worked with our Elite support technical manager to get it resolved.