Peplink router API shut down wifi AP

Hello all,

I’d like to shut down the AP on a Peplink BAX BR1 with the API Post request ‘api/cmd.ap’, as described in the documentation on page 21: https://download.peplink.com/resources/Peplink-Router-API-Documentation-8.4.1.pdf
However, this does not seem to do anything. Anyone else had more success on this?