TF259176: Team Foundation Server could not create or update the environment. The option to join following virtual machines ...

TF259176: Team Foundation Server could not create or update the environment. The option to join following virtual machines to a domain is not supported as network isolation is enabled: {0}. To enable network isolation with domain joined machines, you must:
1) Edit the OS profile of the virtual machines to use a workgroup.
2) Manually join the virtual machines to the environment domain controller when the environment is created and started.