You need to turn on automatic tag detection for the tag domains in question. You then need to employ automatic tag detection on the topics/articles that contain those tag names. This will cause the tags to be associated with the snippets in which those tags appear.
You'll find more details about how this process works within the release notes. It was outlined for the release where this was introduced, but I don't exactly remember which release that was (although it was within the past year).
Hope this helps!
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