using rest api to create a Demand Gen Gampain. error: The operation is not allowed for the given context.

[Jingqiang Liu]

campaign type: DISCOVERY

biddingStrategy:  MAXIMIZE_CONVERSIONS

maximizeConversions: 
cpcBidCeilingMicros=10000.
 cpcBidFloorMicros=10000
 targetCpaMicros=10000


the error is:

 {
    "code": 400,
    "message": "Request contains an invalid argument.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": 
"type.googleapis.com/google.ads.googleads.v15.errors.GoogleAdsFailure",
        "errors": [
          {
            "errorCode": {
              "contextError": "OPERATION_NOT_PERMITTED_FOR_CONTEXT"
            },
            "message": "The operation is not allowed for the given 
context.",
            "trigger": {
              "int64Value": "10990265602"
            },
            "location": {
              "fieldPathElements": [
                {
                  "fieldName": "operations",
                  "index": 0
                },
                {
                  "fieldName": "create"
                },
                {
                  "fieldName": "bidding_strategy"
                }
              ]
            }
          },
          {
            "errorCode": {
              "campaignError": "CANNOT_ATTACH_TO_BIDDING_STRATEGY"
            },
            "message": "Cannot attach the campaign to this bidding 
strategy.",
            "trigger": {
              "int64Value": "10990265602"
            },
            "location": {
              "fieldPathElements": [
                {
                  "fieldName": "operations",
                  "index": 0
                },
                {
                  "fieldName": "create"
                },
                {
                  "fieldName": "bidding_strategy"
                }
              ]
            }
          }
        ],
        "requestId": "tBZu_Kz24vxT2UfKWkElvQ"
      }
    ]
  }
}

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