Reference
Organisation names
The rules for the name an organisation gets in its address, and the names that are taken by the platform.
An organisation is reached on its own subdomain, <name>.brewless.eu. That name has 3 to 40 characters, starts with a letter and holds only lowercase letters, digits and single hyphens.
These names are kept by the platform and cannot be chosen:
adminapiappbrewlessconsoledocshelpmailstagingstatussupportwww
This page is written from the Brewless code with every release, so it always matches what runs.