400 Error for activity

I quite literally enter it as it is in the documentation:

"activity_schedule": {
"mode": "CUSTOM",
"rules": [
{
"type": "INCLUDE",
"day": "MONDAY",
"from_hour": "10",
"until_hour": "18"
},
{
"type": "EXCLUDE",
"day": "SATURDAY",
"from_hour": "0",
"until_hour": "24"
},
{
"type": "EXCLUDE",
"day": "SUNDAY",
"from_hour": "10",
"until_hour": "22"
},
],
"time_zone": "US/Eastern"
},

And I get:

Taboola Error: {"http_status":400,"message":"Bad request","message_code":"api.action.bad_request.null"}

How can this be?

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400 Error for activity_schedule