Deployment template validation failed template parameters 'scriptUrldsc' in the parameters file are not valid they are not present in the original

I'm receiving the error mentioned on the subject, and I'm struggling to fix it. I'm using an ARM template with several nested ARM templates, the deployment is being done using Azure DevOps.

Below the templates.

This first template is the one calling the nested ones:

{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
  "existingDataFactoryName": {
    "type": "string",
    "metadata": {
      "description": "Existing Data Factory name"
    }
  },
  "existingDataFactoryResourceGroup": {
    "type": "string",
    "metadata": {
      "description": "Existing Data Factory resource group"
    }
  },
  "existingDataFactoryVersion": {
    "type": "string",
    "metadata": {
      "description": "Select the existing Data Factory version"
    },
    "allowedValues": [
      "V1",
      "V2"
    ]
  },
  "virtualMachineName": {
    "type": "string",
    "metadata": {
      "description": "Virtual Machine Name where the runtime will run. Please don't provide the last numbers of the VM E.g: EUWE01PROJNIR "
    }
  },
  "IntegrationRuntimeName": {
    "type": "string",
    "metadata": {
      "description": "IR name must be unique in subscription"
    }
  },
  "NodeCount": {
    "type": "int",
    "maxValue": 4,
    "minValue": 1,
    "metadata": {
      "description": "the node count is between 1 and 4."
    }
  },
  "vmSize": {
    "type": "string",
    "defaultValue": "Standard_A4_v2"
  },
  "adminUserName": {
    "type": "string",
    "metadata": {
      "description": "User name for the virtual machine"
    }
  },
  "adminPassword": {
    "type": "securestring",
    "metadata": {
      "description": "Password for the virtual machine"
    }
  },
  "existingVirtualNetworkName": {
    "type": "string",
    "metadata": {
      "description": "Existing vnet name"
    }
  },
  "existingVnetLocation": {
    "type": "string",
    "metadata": {
      "description": "Virtual machine will be create in the same datacenter with VNET"
    }
  },
    "existingVnetResourceGroupName": {
    "type": "string",
    "metadata": {
      "description": "Name of the existing VNET resource group"
    }
  },
  "existingSubnetInYourVnet": {
    "type": "string",
    "metadata": {
      "description": "Name of the subnet in the virtual network you want to use"
    }
  },
  "_artifactsLocation": {
    "type": "string",
    "metadata": {
      "description": "The base URI where artifacts required by this template are located."
    },
    "defaultValue": "[deployment().properties.templateLink.uri]"
  },
  "_artifactsLocationSasToken": {
    "type": "securestring",
    "metadata": {
      "description": "The sasToken required to access _artifactsLocation.  When the template is deployed using the accompanying scripts, a sasToken will be automatically generated."
    },
    "defaultValue": ""
  },
  "diagnosticsStorageAccountName": {
    "type": "string",
    "metadata": {
      "description": "Diagnostic storage account name"
    },
    "defaultValue": ""
  },
    "storageAccountNameRG": {
    "type": "string",
    "metadata": {
      "description": "Diagnostic Resource Group of the Diagnostic storage account"
    },
    "defaultValue": ""
  },
    "availabilitySetName": {
    "type": "string",
    "metadata": {
      "description": "Availability Set Name"
    },
    "defaultValue": ""
  }

},
"variables": {
  "delimiters": [
    "-",
    "_"
  ],      

  "prefix": "[split(parameters('IntegrationRuntimeName'), variables('delimiters'))[0]]",
  "vmTemplateLink": "[uri(parameters('_artifactsLocation'), concat('nested/VMtemplate.json', parameters('_artifactsLocationSasToken')))]",
  "irInstallTemplateLink": "[uri(parameters('_artifactsLocation'), concat('nested/IRInstall.json', parameters('_artifactsLocationSasToken')))]",
  "IRtemplateLink": "[uri(parameters('_artifactsLocation'), concat('nested/IRtemplate.json', parameters('_artifactsLocationSasToken')))]",
  "subnetId": "[resourceId(parameters('existingVnetResourceGroupName'), 'Microsoft.Network/virtualNetworks/subnets', parameters('existingVirtualNetworkName'), parameters('existingSubnetInYourVnet'))]",
  "scriptURL": "[uri(parameters('_artifactsLocation'), concat('gatewayInstall.ps1', parameters('_artifactsLocationSasToken')))]",
  "scriptURLdsc": "[uri(parameters('_artifactsLocation'), concat('DscMetaConfigs.ps1', parameters('_artifactsLocationSasToken')))]"
},
"resources": [
  {
    "type": "Microsoft.Resources/deployments",
    "apiVersion": "2019-09-01",
    "name": "nestedTemplate",
    "resourceGroup": "[parameters('existingDataFactoryResourceGroup')]",
    "properties": {
      "mode": "Incremental",
      "templateLink": {
        "uri": "[variables('IRtemplateLink')]",
        "contentVersion": "1.0.0.0"
      },
      "parameters": {
        "existingDataFactoryName": {
          "value": "[parameters('existingDataFactoryName')]"
        },
        "existingDataFactoryVersion": {
          "value": "[parameters('existingDataFactoryVersion')]"
        },
        "IntegrationRuntimeName": {
          "value": "[parameters('IntegrationRuntimeName')]"
        }
      }
    }
  },
  {
    "type": "Microsoft.Resources/deployments",
    "apiVersion": "2019-09-01",
    "name": "[concat('VMtemplate-', copyIndex())]",
    "dependsOn": [
      "[resourceId(parameters('existingDataFactoryResourceGroup'), 'Microsoft.Resources/deployments', 'nestedTemplate')]"
    ],
    "copy": {
      "name": "vmcopy",
      "count": "[parameters('NodeCount')]"
    },
    "properties": {
      "mode": "Incremental",
      "templateLink": {
        "uri": "[variables('vmTemplateLink')]",
        "contentVersion": "1.0.0.0"
      },
      "parameters": {
        "virtualMachineName": {
          "value": "[take(concat(parameters('virtualMachineName'),'0',copyIndex(1)), 15)]"
        },
        "vmSize": {
          "value": "[parameters('vmSize')]"
        },
        "adminUserName": {
          "value": "[parameters('adminUserName')]"
        },
        "adminPassword": {
          "value": "[parameters('adminPassword')]"
        },
        "existingVnetLocation": {
          "value": "[parameters('existingVnetLocation')]"
        },
        "subnetId": {
          "value": "[variables('subnetId')]"
        },
        "diagnosticsStorageAccountName": {
          "value": "[parameters('diagnosticsStorageAccountName')]"
        },
        "availabilitySetName": {
        "value":  "[parameters('availabilitySetName')]"
        },
        "storageAccountNameRG": {
          "value":  "[parameters('storageAccountNameRG')]"
        }
      }
    }
  },
  {
    "apiVersion": "2019-09-01",
    "type": "Microsoft.Resources/deployments",
    "name": "[concat('IRInstalltemplate-', copyIndex())]",
    "dependsOn": [
      "vmcopy"
    ],
    "copy": {
      "name": "irinstallcopy",
      "count": "[parameters('NodeCount')]",
      "mode": "serial"
    },
    "properties": {
      "mode": "Incremental",
      "templateLink": {
        "uri": "[variables('irInstallTemplateLink')]",
        "contentVersion": "1.0.0.0"
      },
      "parameters": {
        "existingDataFactoryVersion": {
          "value": "[parameters('existingDataFactoryVersion')]"
        },
        "datafactoryId": {
          "value": "[reference(resourceId(parameters('existingDataFactoryResourceGroup'), 'Microsoft.Resources/deployments', 'nestedTemplate')).outputs.irId.value]"
        },
        "virtualMachineName": {
          "value": "[take(concat(parameters('virtualMachineName'),'0',copyIndex(1)), 15)]"
        },
        "existingVnetLocation": {
          "value": "[parameters('existingVnetLocation')]"
        },
        "scriptUrl": {
          "value": "[variables('scriptURL')]"
        },
        "scriptUrldsc": {
          "value": "[variables('scriptURLdsc')]"
        }
      }
    }
  }
]

}

And this one is where "scriptUrldsc" parameter is being used inside of the nested template.

{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
  "existingDataFactoryVersion": {
    "type": "string"
  },
  "datafactoryId": {
    "type": "string"
  },
  "virtualMachineName": {
    "type": "string"
  },
  "existingVnetLocation": {
    "type": "string"
  },
  "scriptUrl": {
    "type": "string"
  },
  "scriptUrldsc": {
    "type": "string"
  }
},
"variables": {},
"resources": [
  {
    "type": "Microsoft.Compute/virtualMachines/extensions",
    "name": "[concat(parameters('virtualMachineName'), '/' ,parameters('virtualMachineName'), '-installGW')]",
    "apiVersion": "2019-07-01",
    "location": "[parameters('existingVnetLocation')]",
    "tags": {
      "virtualMachineName": "[parameters('virtualMachineName')]"
    },
    "properties": {
      "publisher": "Microsoft.Compute",
      "type": "CustomScriptExtension",
      "typeHandlerVersion": "1.7",
      "autoUpgradeMinorVersion": true,
      "settings": {
        "fileUris": [
          "[parameters('scriptURL')]",
          "[parameters('scripturldsc')]"
        ]
      },
      "protectedSettings": {
        "commandToExecute": "[concat('powershell.exe -ExecutionPolicy Unrestricted -File gatewayInstall.ps1', if(equals(parameters('existingDataFactoryVersion'), 'V2'), listAuthKeys(parameters('datafactoryId'), '2017-09-01-preview').authKey1, listAuthKeys(parameters('datafactoryId'), '2015-10-01').key1))]"
      }
    }
  }
]

}