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If the user is an artisan it'll probably mean that the user needs to be validated. The user themselves can do this by logging in and clicking on the ! in the top right of the screen. This will send an email confirmation code which needs to be entered.
However, if SMTP is not setup then your administrator is able to click on users --> Username --> Validate user (option is at the bottom of the screen)
I will echo what @NickC said - this is fairly common where a user that only uses Designer gets added to the server, and before logging in to the gallery (which validates their user), they try to publish and encounter such an error.
Simply have your user log into the gallery and confirm that they can see their own gallery and have validated their login as described.
If the above doesnt work, can you please let us know what version of Alteryx Server and Alteryx Designer are being used?