FlexConsumption Deployment AzureDevops Error

[chrisgray94]

• I am using dotnet-isolated runtime and version 8.0
• I have deployed Flex Consumption plan and app via Bicep.
• I am using the AzureWebJobsStorage__accountname app setting and system assigned identity which I have given Storage Blob Data Contributor access to the storage account.
• I am using vnet integration and the subnet also has access to the storage account.
• I am using az functionapp deployment source config-zip CLI task in AzurePipelines yml file to deploy the code to the container I am using inside the deployment settings. However, the task always fails with:
  • "ERROR: Failed to fetch host key to check for function app status".

Any ideas? I do have other app settings for things like service bus which I have given access to with the identity as above.

Please find the bicep template below. I apologise if I've raised this in the wrong repository.

resource flexApp 'Microsoft.Web/sites@2023-12-01' = {
  name: appName
  kind: 'functionapp,linux'
  location: location
  tags: {
    app: app
    environment: environment
  }
  properties: {
    httpsOnly: true
    serverFarmId: flexPlan.id
    virtualNetworkSubnetId: subnetId
    siteConfig: {
      appSettings: appSettings
      minTlsVersion: '1.2'
      http20Enabled: true
      publicNetworkAccess: 'Enabled'
      cors: {
        allowedOrigins: [
          corsUrl
        ]
      }
    }
    functionAppConfig: {
      deployment: {
        storage: {
          type: 'blobContainer'
          value: 'https://${storageAccountName}.blob.${az.environment().suffixes.storage}/${storageContainerName}'
          authentication: {
            type: 'SystemAssignedIdentity'
          }
        }
      }
      scaleAndConcurrency: {
        maximumInstanceCount: numOfInstances
        instanceMemoryMB: 2048
      }
      runtime: { 
        name: runtimeName
        version: netFrameworkVersion
      }
    }
  }
  identity: {
    type: 'SystemAssigned'
  }
}

In the portal I also see this