title: Azure Pipeline Deployment to App Service fails: "Resource doesn't exist. Resource should exist before deployment". But App Service is running
body: <p>I'm doing the Microsoft tutorial "Create Multi-stage Pipeline", exercise "Promote to Dev Stage": <a href="https://docs.microsoft.com/en-us/learn/modules/create-multi-stage-pipeline/4-promote-dev" rel="noreferrer">https://docs.microsoft.com/en-us/learn/modules/create-multi-stage-pipeline/4-promote-dev</a></p>
  
  <p>This involves creating an Azure App Service, in my case named "tailspin-space-game-web-dev-4960.azurewebsites.net", and a multi-stage pipeline in Azure DevOps to build a web application project and deploy it to the App Service.</p>
  
  <p>When I go to run the pipeline the deployment stage fails with the following message in the log:</p>
  
  <blockquote>
    <p>Error: Resource 'tailspin-space-game-web-dev-4960.azurewebsites.net' doesn't exist. Resource should exist before deployment.</p>
  </blockquote>
  
  <p>I've copied and pasted the URL <a href="http://tailspin-space-game-web-dev-4960.azurewebsites.net" rel="noreferrer">http://tailspin-space-game-web-dev-4960.azurewebsites.net</a> into another browser window to confirm the App Service exists and is running (although it's currently just showing the default app page since I haven't been able to deploy my application to it).</p>
  
  <p>My question is:  How do I test the service connection in Azure DevOps that should connect to the App Service?  Alternatively, how do I debug the issue?</p>
  
  <p>I haven't been able to find anything online about this error, and the only debugging info from Microsoft is about errors in creating service connections, not using them.  I also can't find anything about testing service connections - the only advice I've found is to run them in the pipeline, which is a bit circular since that is where the error is occurring.</p>
  
  <p>I've turned on verbose logging on the pipeline.  This is the log from the failing deployment task (blank line added to highlight where it's attempting to get connection details):</p>
  
  <pre><code>##[debug]system.culture=en-US
  ##[debug]check path : /home/vsts/work/_tasks/AzureWebApp_18bde28a-8172-45cb-b204-5cef1393dbb1/1.163.2/node_modules/azurermdeploycommon/module.json
  ##[debug]adding resource file: /home/vsts/work/_tasks/AzureWebApp_18bde28a-8172-45cb-b204-5cef1393dbb1/1.163.2/node_modules/azurermdeploycommon/module.json
  ##[debug]system.culture=en-US
  ##[debug]azureSubscription=5d6d337f-3ceb-4a1d-8077-79e8c462faaf
  ##[debug]appType=null
  ##[debug]deployToSlotOrASE=false
  ##[debug]customWebConfig=null
  ##[debug]appSettings=null
  ##[debug]startUpCommand=null
  ##[debug]configurationStrings=null
  ##[debug]resourceGroupName=null
  ##[debug]slotName=production
  ##[debug]appName=tailspin-space-game-web-dev-4960.azurewebsites.net
  ##[debug]customDeployFolder=null
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth scheme = ServicePrincipal
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data subscriptionid = 7258ca03-764d-4d8a-94e2-1f12bcd06be1
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data subscriptionname = Visual Studio Premium with MSDN
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth param serviceprincipalid = ***
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data environmentAuthorityUrl = https://login.windows.net/
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth param tenantid = ***
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf=https://management.azure.com/
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data environment = AzureCloud
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth scheme = ServicePrincipal
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data msiclientId = undefined
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data activeDirectoryServiceEndpointResourceId = https://management.core.windows.net/
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data AzureKeyVaultServiceEndpointResourceId = https://vault.azure.net
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data AzureKeyVaultDnsSuffix = vault.azure.net
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth param authenticationType = ***
  ##[debug]credentials spn endpoint
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf auth param serviceprincipalkey = ***
  ##[debug]5d6d337f-3ceb-4a1d-8077-79e8c462faaf data EnableAdfsAuthentication = false
  ##[debug]{"subscriptionID":"7258ca03-764d-4d8a-94e2-1f12bcd06be1","subscriptionName":"Visual Studio Premium with MSDN","servicePrincipalClientID":"***","environmentAuthorityUrl":"https://login.windows.net/","tenantID":"***","url":"https://management.azure.com/","environment":"AzureCloud","scheme":"ServicePrincipal","activeDirectoryResourceID":"https://management.azure.com/","azureKeyVaultServiceEndpointResourceId":"https://vault.azure.net","azureKeyVaultDnsSuffix":"vault.azure.net","authenticationType":"***","servicePrincipalKey":***,"isADFSEnabled":false,"applicationTokenCredentials":{"clientId":"***","domain":"***","baseUrl":"https://management.azure.com/","authorityUrl":"https://login.windows.net/","activeDirectoryResourceId":"https://management.azure.com/","isAzureStackEnvironment":false,"authType":"***","secret":***,"isADFSEnabled":false}}
  
  Got service connection details for Azure App Service:'tailspin-space-game-web-dev-4960.azurewebsites.net'
  ##[debug][POST]https://login.windows.net/***/oauth2/token/
  ##[debug][GET]https://management.azure.com/subscriptions/7258ca03-764d-4d8a-94e2-1f12bcd06be1/resources?$filter=resourceType EQ 'Microsoft.Web%2FSites' AND name EQ 'tailspin-space-game-web-dev-4960.azurewebsites.net'&amp;api-version=2016-07-01
  ##[debug]Correlation ID from ARM api call response : 37546212-3807-41bf-8985-9c811d0f9c75
  ##[debug]Deployment Failed with Error: Error: Resource 'tailspin-space-game-web-dev-4960.azurewebsites.net' doesn't exist. Resource should exist before deployment.
  ##[debug]task result: Failed
  ##[error]Error: Resource 'tailspin-space-game-web-dev-4960.azurewebsites.net' doesn't exist. Resource should exist before deployment.
  ##[debug]Processed: ##vso[task.issue type=error;]Error: Resource 'tailspin-space-game-web-dev-4960.azurewebsites.net' doesn't exist. Resource should exist before deployment.
  ##[debug]Processed: ##vso[task.complete result=Failed;]Error: Resource 'tailspin-space-game-web-dev-4960.azurewebsites.net' doesn't exist. Resource should exist before deployment.
  ##[debug]Deployment failed
  </code></pre>