If you have an earlier version of Mac OS X and are unable to update it, head to that same url and download Xcode 3.2.6 if you are using Mac OS X 10.6 (Snow Leopard) and Xcode 3.1.4 if you are using Mac OS X 10.5 (Leopard).
![Visual Studio For Mac Xcode Version Visual Studio For Mac Xcode Version](https://developercommunity.visualstudio.com/storage/temp/11430-version.png)
Thank you for your feedback. VSTS Hosted macOs has now both Xcode 10 and Xcode 10.1 beta installed.
Please refer to official document - VSTS Hosted macOS Preview image: By default, the latest installed version is used. Try to select the Xcode version on the task page: choose Specific path as the Xcode version and the variable $(XCODE10DEVELOPERDIR) as the developer version path. Please have a try. ^^ Or if you can build successfully with local Mac machine, you can install private agent in this machine and run using private agent as well. Please refer to official document - Deploy an agent on OS: Please click 'Accept' button to mark the solution if this helps you or add a comment to let us know if you have more questions about this so that we can reopen the ticket and investigate this further.
Thank you for your understanding.