Contrary to the similar PATCH method (of the same endpoint), the entirety of the trigger data being updated needs to be sent.

• {"name": "Trigger Name Update"} will update the trigger and remove any existing tags.
• {"tags": [{"label": "A New Tag", "value": "{a_new_tag}"}]} by itself will fail because the name property is required
• {"name": "Trigger Name Update", "tags": [{"label": "A New Tag", "value": "{a_new_tag}"}]} will set the trigger name to Trigger Name Update and override any existing tags with the list of tags from the request.