Windows Server 2016 support was introduced in CA Client Automation version 14.0 SP1.
If the version installed is 14.0 SP1 and Win 2016 is not listed do the following:
1. On the Domain Manager, rename OSconfig.xml to OSConfig_old.xml.
Default Location: ..\CA\DSM\Agent\
2. Copy 'OSConfig.xml' (file size - 91.4 KB) from a 14.0 SP1 agent to the Domain Manager.
Default Location on the Agent: ..\CA\DSM\Agent\
3. Restart CAF using 'caf restart'.