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There should not be a second dash at the title entry
This is a general yaml issue.
When there is a dash it indicates a new entry, so in this case the new entry is of action test and then you can specify properties of that entry without a dash. So the title.
This is working as intended on hass.agent side because it sees a test notification action and displays it, because there is no title passed to it there is just a blank action button. The next entry is title: HEY(because of the dash) which is not a valid entry so it skips it.