Question: I have a requirement to use exactly iOS 14.5 on our pipeline.

I tried the following:

```
variables:
  sdk: 'iphoneos14.5' // I also tried to iphoneos

- task: Xcode@5
  inputs:
    actions: 'test'
    configuration: '$(configuration)'
    sdk: '$(sdk)'
    xcWorkspacePath: 'MyProject.xcworkspace'
    scheme: '$(secondaryScheme)'
    xcodeVersion: 'specifyPath'
    xcodeDeveloperDir: '/Applications/Xcode_13.2.1.app'
    packageApp: false
    destinationPlatformOption: 'iOS'
    destinationSimulators: 'iPhone 11,OS=14.5'
    args: '-derivedDataPath $(agent.buildDirectory)/DerivedData'

```

But both runs failed with

```
xcodebuild: error: SDK "iphoneos14.5" cannot be located.
##[error]Error: /usr/bin/xcodebuild failed with return code: 64

```

And

```
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
        { platform:iOS Simulator, OS:14.5, name:iPhone 11 }

```

That's what I understood from reading the preinstalled software documentation. <https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11-Readme.md>

Grateful if you could tell me what I am doing wrong

Answer: 
By using your pipeline definition, I am able to reproduce your issue.

[![enter image description here](https://i.stack.imgur.com/0n8it.png)](https://i.stack.imgur.com/0n8it.png)

I think below YAML file will help you understand why the official document said 'iOS 14.5' is supported but you can't use it.

```
pool:
  name: Azure Pipelines
#Your build pipeline references an undefined variable named ‘secondaryScheme’. Create or edit the build pipeline for this YAML file, define the variable on the Variables tab. See https://go.microsoft.com/fwlink/?linkid=865972

steps:
- script: |
   xcodebuild -showsdks

   echo "========================================================="

   sudo xcode-select -switch /Applications/Xcode_12.5.1.app/Contents/Developer

   xcodebuild -showsdks
  displayName: 'Command Line Script'

```

When you see the result of the pipeline run, I believe you will understand everything：

[![enter image description here](https://i.stack.imgur.com/uBYAY.png)](https://i.stack.imgur.com/uBYAY.png)

After switching the version, you should be able to use the specific IOS version you want.

Reference: <https://developer.apple.com/documentation/security/notarizing_macos_software_before_distribution/customizing_the_notarization_workflow>

> 
> You upload your app for notarization using notarytool command line
> tool. Xcode 13 or later supports this tool, so if you have more than
> one version of Xcode installed on your Mac, be sure to use the
> xcode-select utility to choose an appropriate version:
> 
> 
> % sudo xcode-select -s /path/to/Xcode13.app
> 
> 
>
Added this step

```
gem install xcode-install
xcversion simulators --install='iOS 13.5'

```

If someone finds a way to use the installed sdk for other Xcode, please comment here