Can't add Youtube channel to Campaign Placements - Mutates are not allowed

[dmitrys-svsgco]

Describe the bug:

When I try to add Youtube channel to Campaign Placements the following method fails
with "Mutates are not allowed for the requested resource"

Steps to Reproduce:

Use this method:

def add_youtube_channel_to_ad_group(client, customer_id, ad_group_id, channel_id):
    ad_group_criterion_service = client.get_service("AdGroupCriterionService")
    ad_group_service = client.get_service("AdGroupService")

    # Create a new AdGroupCriterion for the YouTube channel
    ad_group_criterion = client.get_type("AdGroupCriterion")
    # ad_group_criterion.ad_group = f"customers/{customer_id}/adGroups/{ad_group_id}"
    ad_group_criterion.ad_group = ad_group_service.ad_group_path(customer_id, ad_group_id)
    ad_group_criterion.status = client.get_type("AdGroupCriterionStatusEnum").ENABLED
    ad_group_criterion.negative = False
    ad_group_criterion.type_ = client.enums.CriterionTypeEnum.YOUTUBE_CHANNEL
    ad_group_criterion.youtube_channel.channel_id = channel_id

    ad_group_criterion_operation = client.get_type("AdGroupCriterionOperation")
    ad_group_criterion_operation.create.CopyFrom(ad_group_criterion)

    operations = [ad_group_criterion_operation]

    try:
        response = ad_group_criterion_service.mutate_ad_group_criteria(
            customer_id=customer_id, operations=operations
        )
        print(f"Added YouTube Channel criterion with ID: {channel_id} to Ad Group: {ad_group_id}")
    except GoogleAdsException as ex:
        print(ex)

Expected behavior:
I expect YouTube channel being added to Placements

Client library version and API version:
google-ads = "24.0.0"
google-api-core = "2.13.0"
google-api-python-client = "2.78.0"
google-auth = "2.15.0"
google-auth-httplib2 = "0.1.0"
google-auth-oauthlib = "1.0.0"

Request/Response Logs:

Method: /google.ads.googleads.v16.services.AdGroupCriterionService/MutateAdGroupCriteria
Host: googleads.googleapis.com
Headers: {
  "developer-token": "REDACTED",
  "x-goog-api-client": "gl-python/3.11.0rc1 grpc/1.62.2 gax/2.13.0 gccl/24.0.0 pb/4.25.5",
  "x-goog-request-params": "customer_id=94....92"
}
Request: customer_id: "94....92"
operations {
  create {
    status: ENABLED
    ad_group: "customers/94....92/adGroups/1...2"
    type_: YOUTUBE_CHANNEL
    negative: false
    youtube_channel {
      channel_id: "UCWZwfV3ICOt3uEPpW6hYK4g"
    }
  }
}


Response
-------
Headers: {
  "google.ads.googleads.v16.errors.googleadsfailure-bin": "\nT\n\u00028\t\u00123Mutates are not allowed for the requested resource.\u001a\u0007*\u0005VIDEO\"\u0010\u0012\u000e\n\noperations\u0018\u0000\u0012\u0016Hf7Ro1_Ps4tUbZW-TkYj-g",
  "grpc-status-details-bin": "\b\u0003\u0012%Request contains an invalid argument.\u001a\u0001\nDtype.googleapis.com/google.ads.googleads.v16.errors.GoogleAdsFailure\u0012n\nT\n\u00028\t\u00123Mutates are not allowed for the requested resource.\u001a\u0007*\u0005VIDEO\"\u0010\u0012\u000e\n\noperations\u0018\u0000\u0012\u0016Hf7Ro1_Ps4tUbZW-TkYj-g",
  "request-id": "Hf7Ro1_Ps4tUbZW-TkYj-g"
}
Fault: errors {
  error_code {
    mutate_error: MUTATE_NOT_ALLOWED
  }
  message: "Mutates are not allowed for the requested resource."
  trigger {
    string_value: "VIDEO"
  }
  location {
    field_path_elements {
      field_name: "operations"
      index: 0
    }
  }
}
request_id: "Hf7Ro1_Ps4tUbZW-TkYj-g"