I ran into this exact same problem in my own environment, and it turned out to be because it was running with a Free license - the DB Connect app attempts to query the server for available Roles, and trying to do that on a Free-licensed server results in the error message "Requires license feature='Auth'" which causes the above-mentioned Javascript error. The documentation for this app makes no mention of this requirement - in fact, the Fact Sheet suggests that it should work (by suggesting you start with a Trial license and potentially convert to a perpetual Free license).
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