@Detected You have used the Get action and are adding your body to the headers. You need to use POST request - you can change the method to DELETE in the Post action
None of the ideas you gave worked, but thanks anyway. It resolved on its own, and if you encounter this issue, the solution is simply to wait — it gets fixed after 24 hours.
@G99Kfn3x3ku The problem with the slow work of BAS is connected exclusively with the firewall. In future updates, @support will fix this, but for now only through adding to exceptions.