The viya-cli tool implicitly requires a direct link to sas.com Internet portal in order to install the plug-ins collection . Except for cloud jumpboxes or personal Macbook, on-premise installation within large organisations use company proxy servers to reach the internet, which means that
either viya-cli archive has to be provided, as a download archive, in sas.com portal in a portable version, including every plugin OOTB inclusively (1),
or viya-cli install syntax must be able to use http/https proxy settings (environment variables HTTP_PROXY, HTTPS_PROXY) (2)
or both !
The following discussion might imply that the option (2) is already planned in a future release.