delete https://api.miro.com/v2/boards//tags/
Deletes the specified tag from the board. The tag is also removed from all cards and sticky notes on the board.
Note: Updates to tags made via the REST API will not be reflected on the board in realtime. To see REST API updates to tags on a board, you need to refresh the board. This applies to the following endpoints: Attach tag to item, Remove tag from item, Update tag.