[Python] What Promoted Object should I use when creating an AdSet with lead_generation...

I'm using facebookads python api, v2.6.

I'm trying to create an AdSet with optimization goal = lead_generation.

This is my code:

ad_set = AdSet(parent_id = 'act_%s' % FB_ACCOUNT)
ad_set[AdSet.Field.name]= 'Teste AdSet'
ad_set[AdSet.Field.campaign_id]='6043402838999'
ad_set[AdSet.Field.status]=AdSet.Status.paused
ad_set[AdSet.Field.billing_event] = AdSet.BillingEvent.impressions
ad_set[AdSet.Field.optimization_goal] = AdSet.OptimizationGoal.lead_generation
ad_set[AdSet.Field.daily_budget]= 100
ad_set[AdSet.Field.bid_amount]= 1
ad_set[AdSet.Field.start_time]= '2016-07-01'
ad_set[AdSet.Field.promoted_object]=
ad_set[AdSet.Field.targeting]= {Targeting.Field.geo_locations: { 'countries': ['BR']},Targeting.Field.genders: [1],Targeting.Field.age_min: 20,Targeting.Field.age_max: 24}

ad_set.remote_create()


But when I run this I get this error:

Status: 400
Response:
{
"error": {
"code": 100,
"is_transient": false,
"error_subcode": 1885024,
"error_user_msg": "When creating an ad set within a campaign using the Body of an error/warning message. Title is: Promoted Object Missing objective, a promoted object must be specified.",
"error_user_title": "Promoted Object Missing",
"message": "Invalid parameter",
"type": "OAuthException",
"fbtrace_id": "B9hyZlpzS7O"
}
}


I tried to find any documentation about this, but could not. On the official docs I don't see LEAD_GENERATION on the promoted objects options:

https://developers.facebook.com/docs/marketing-api/reference/ad-campaign#Creating

Anyone had this problem?

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