Named user tags not propagating

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I am just starting to integrate Airship with our platform, and exploring how to use tag groups and tags. My app id is: c_JpoXydRJS4wMOlvp5qCQ

For a single named user (named "18946") I added a tag "Halal Guys Koreatown" to a tag group i had defined via the dashboard. I see that tag when then do a GET for https://go.urbanairship.com/api/named_users:

{
  "ok": true,
  "named_users": [
    {
      "named_user_id": "18946",
      "tags": {
        "restaurants": [
          "Halal Guys Koreatown"
        ]
      },
      "created": "2019-06-12T22:48:46",
      "last_modified": "2019-06-13T02:39:14",
      "channels": []
    },

}

but when i try to use the dashboard to send a message to a specific set of users, and specify that tag ("Halal Guys Koreatown") it can't find the tag. could someone help me understand where i've gone wrong?

Thanks!