Fortigate 100D API version 5.6 blocking device by mac address

Hi,

I'm trying to block/unblock a device by device mac address via rest API.

so far I tried using a post request to the URL  /api/v2/monitor/endpoint-control/registration/block/  with the mac address as a parameter, I tried in many ways but I always get response 400 bad request ...

I also see via web UI the possibility to filter (block) a device by MAC adding it to SSID filter MAC, I didn't find any reference of it in API guide.

Can anyone please help me?

Thanks.