FASTBuild documentation can be found here:
Open issues are tracked on GitHub. You can access the knowledge of the FASTBuild community there, or see if your question has already been answered. Publicly asking your question may help others too.
This is the best place to raise bug reports, feature requests or to ask general questions.
If you'd like to propose a change for integration into FASTBuild, you can do so via GitHub.
If the documentation or GitHub doesn't help, or your question can't be asked publicly, you can send an email for private support.