This feature must be enabled by Zoom and each additional vanity URL must follow the same guidelines detailed above to be approved by Zoom.
Important:
Please work with your Zoom support to enable the multiple vanity URL or Multiple IDPs once the support ticket is opened. Enabling multiple vanity URL or IDPs will change the SP entity ID field for your existing SSO. Schedule a downtime for your SSO and coordinate the time with Zoom support to enable this feature. Account Admins require to update the SSO configuration in Zoom admin portal and also update the IDP configuration with the new SP entity id.