Subject Alternative Name (SAN) certificates are supported for Workplace, Workplace sites, and Connect Tunnel. Certificates (also called UCC--Unified Communications Certificate) are used to securely encrypt communication channels between a set of clients and multiple distinct SSL or TLS services.
SAN certificates simplify the IP address/hostname/certificate sets needed for a typical deployment. With a single SAN certificate, you can utilize one IP address with multiple distinct SSL or TLS protected web or client/server services. Additionally, SANs can be used for different host names on the same IP address, alleviating the need for a one-to-one mapping of SSL certificate Common Names to FQDN.
Only IPv4 addresses are supported in SAN certificates and Certificate Signing Requests (CSR).