• Workspace name must start with a-Z or 0-9 and can contain a-Z, 0-9 or -
• The workspace name seems to have a limit of 32 characters.
• They also don't seem to accept special characters / whitespaces.
• Duplicate workspace names are not allowed

One can easily miss this when creating workspaces through API. Requesting an update at https://coder.com/docs/api/schemas#properties-69