Hi,
In R12.6.x release there is no Web Agent, and this is why there is no information on the latest Platform Support Matrix regarding Web Agents. You can use Web Agents from earlier release (R12.52 SP1) which are supported, or Access Gateway which is released with R12.6.x
Please, find the R12.6.x announcement below:
https://communities.ca.com/docs/DOC-231171767
Best regards,
Albert F.