I have a large, complex Azure BICEP deployment script. It works 100%, however I get an intermittent transient error from Azure.

    {
  "code": "DeploymentFailed",
  "target": "/subscriptions/xx-xx-xx-xx-xx/resourceGroups/xx-xx-rg-tst-xx-eus-99/providers/Microsoft.Resources/deployments/webAppSubCreateWeb-xx-xx-app-xx-tst-aty-eus-99-dev",
  "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.",
  "details": [
    {
      "code": "InternalServerError",
      "message": "There was an unexpected InternalServerError.  Please try again later.  x-ms-correlation-request-id: xxxx"
    }
  ]
}

The error will always happen when deploying a web app from an string array; it’s not always the same web app. A lot of times there is no error.

Am I doing anything wrong? Can I do anything better to protect my deployment from InternalServerError?

‘main’

@batchSize(6)
module webAppSubCreateApi 'webAppSubCreate.bicep' = [for (web,i) in webApplicationsToCreateApi: {
  name: 'webAppSubCreateApi-${web}'
  params: {
    location: location
    createAppServicePlanId: createAppServicePlanApi.id
    identityId: identity.id
    vnetSubNetId: vnetSubNetId
    webapp: web
    appInsightsConnectionString: appInsights.properties.ConnectionString
  }
  dependsOn: [createAppServicePlanApi, identity, workspace]
}]

Module

param webapp string
param location string
param identityId string
param createAppServicePlanId string
param vnetSubNetId string
param appInsightsConnectionString string

//create web app instances, one for each web application in the list webApplicationsToCreate
resource createWebApp 'Microsoft.Web/sites@2023-01-01' =  { 
  name: webapp
  location: location
  kind: 'windows'
  identity: {
    type:'UserAssigned'
    userAssignedIdentities: {
      '${identityId}': {}     
    }  
  }
    properties: {
      httpsOnly: true
      serverFarmId: createAppServicePlanId
      reserved: false     
      vnetRouteAllEnabled: false
      siteConfig:{
        alwaysOn:true        
        netFrameworkVersion: '6.0'
        metadata:[
        {
          name: 'CURRENT_STACK'
          value: 'dotnet'
        }
        {
          name: 'netFrameworkVersion'
          value: 'v6.0'
        }               
      ]  
      appSettings:[
        {
          name: 'APPLICATIONINSIGHTS_CONNECTION_STRING'
          value: appInsightsConnectionString
        }
      ]         
    }    
    virtualNetworkSubnetId:vnetSubNetId    
  }
}

output webappparentname string = createWebApp.name