A breaking change was introduced in the API by this morning's release. This does not affect the web UI.
create workspace endpoint has a new required field,
authorizationDomain, which was previously optional. This refers to the Authorization Domain security feature, which enables you to set boundaries on workspace sharing permissions. If you do not want to assign an authorization domain to the workspace you are creating, you can set the field to
Please accept our apologies for this unanticipated breaking change. We will review our procedures to ensure that breaking changes are not allowed to happen without advance notification and sufficient justification for the inconvenience caused to FireCloud API users.